Democrats who are running Joe Biden (D)After months of deliberation, former Vice President Joe Biden April 25 announced his decision to run for president for a third time, answering one of the biggest outstanding questions about the makeup of the 2020 race.The announcement came in a campaign video. In his campaign announcement video, Biden rebuked the white supremacist rally in Charlottesville, Virginia, in August 2017 and President Donald Trump's handling of the aftermath. ---Republicans running for PresidentDonald Trump (R)Donald J. Trump, 45th president of the United States, is running for re-election. Trump won the 2016 first-in-the-nation primary by a 35% to 16% margin over former Ohio Gov. John Kasich, while other candidates trailed far behind. Trump then narrowly lost New Hampshire general election to Hillary Clinton. Her margin of victory in the Granite State was 2,700 votes out of about 750,000 votes cast. Libertarians running for President Lincoln Chafee (L)Former Rhode Island Gov. Lincoln Chafee filed to run for president in 2020 as a libertarian following his failed campaign for the Democratic nomination in 2016. Chafee filed paperwork with the Federal Election Commission Sunday to form the Lincoln Chafee for President campaign committee based in Wyoming.A website linked to Chafee's FEC filing states "Lincoln Leads with TRUTH" along with the phrase "Thirty Years, Zero Scandals."Chafee has spent most of his life as a Republican. He was nominated to his late father's Senate seat in 1999 and then was elected as a Republican in 2000. He served only one term, losing to Democrat Sheldon Whitehouse in 2006, but then successfully ran for governor of Rhode Island as an independent.---Candidates who have ended their campaignsJoe Sestak (D)Former Pennsylvania Rep. Joe Sestak ended his long shot 2020 presidential bid Dec. 1 after failing to gain traction in the race for the Democratic Party's nomination. "I want to thank you for the honor of running for President of the United States of America," Sestak said in a statement. "It has been an endeavor filled with immeasurable wisdom, passions, humor and insights to, and from, the people of America."Sestak, who mounted unsuccessful bids for U.S. Senate in 2010 and 2016, entered an already-crowded Democratic primary field in June, hoping to leverage his career in the U.S. Navy into a successful campaign.Mark Sanford (R) Mark Sanford, the former South Carolina governor and congressman, initially decided to launch a long shot Republican challenge to President Trump.When asked why he was taking on an incumbent who's popular within the party, Sanford said: "I think we need to have a conversation on what it means to be a Republican. I think that as the Republican Party, we have lost our way."The 59-year-old Sanford ended his campaign in November 2019.He has long been an outspoken critic of Trump's. He frequently questioned Trump's motivations and qualifications during the run-up to the 2016 presidential election and called Trump's candidacy "a particularly tough pill to swallow."Beto O'Rourke (D)Beto O'Rourke announced his run for president on March 14, 2019 and dropped out of the race on Nov. 1, 2019.During his campaign, he called for Americans to look past their differences in order to confront the challenges facing the country."This is a defining moment of truth for this country and for every single one of us," the 46-year-old Democratic former congressman from Texas said in a video announcing his candidacy. "The challenges that we face right now, the interconnected crises in our economy, our democracy and our climate have never been greater.""They will either consume us, or they will afford us the greatest opportunity to unleash the genius of the United States of America," he added. Tim Ryan (D)U.S. Rep. Tim Ryan announced his intention to run for the democratic nomination on April 4, 2019 and declared he was ending his campaign Oct. 24, 2019. Ryan, 46, is serving in his ninth term in the U.S. House representing Northeastern Ohio. Ryan unsuccessfully challenged Rep. Nancy Pelosi for U.S. House Minority Leader in 2017 and briefly considered challenging her again this year for U.S. House Speaker, but decided against it.Bill de Blasio (D)New York City Mayor Bill de Blasio announced Sept. 20, 2019, that he was ending his presidential campaign."I feel like I've contributed all I can to this primary election and it's clearly not my time," de Blasio said on MSNBC's "Morning Joe." "So I'm going to end my presidential campaign, continue my work as mayor of New York City, and I'm going to keep speaking up for working people and for a Democratic Party that stands for working people."Kirsten Gillibrand (D)U.S. Sen. Kirsten Gillibrand announced Aug. 28, 2019 she was ending her campaign. She said it was important to know when it's not your time and thanked her supporters.She jumped in the race by declaring her candidacy with a campaign video titled "Brave Wins." Gillibrand was appointed to the U.S. Senate in 2009 after Hillary Clinton resigned to become Secretary of State and was elected in 2010 and 2016.Kamala Harris (D) Kamala Harris, the U.S. senator from California, ended her quest to be the democratic candidate for president in Dec. 2019.Harris started her campaign in a strong position in the polls, but her popularity quickly fell in early primary states.Harris, 54, announced on Jan. 21, 2019, that she was running for president, skipping the step of forming an exploratory committee. Harris previously served as California’s attorney general for eight years before being elected to the Senate.John Hickenlooper (D) Former Colorado Gov. John Hickenlooper ended his campaign Aug. 15, 2019, sharing the decision on Twitter with a three-minute video. He launched his 2020 campaign while noting his Western roots and decades of executive experience. His decision to run was also announced in a video, which tracked his life from laid-off geologist, to owner of a brew pub, to mayor of Denver and to governor.Eric Swalwell (D)U.S. Rep. Eric Swalwell, 38, is in his fourth term representing California's 15th Congressional District and a member of the House Intelligence and Judiciary committees.Swalwell announced his campaign on CBS' "Late Show." He told host Stephen Colbert that the country is in "quicksand," further explaining that Americans feel as though they are "running in place and it is not adding up to anything."On July 8, 2019, he declared he was ending his run, saying he would run for reelection in his House seat.Jay Inslee (D) Washington Gov. Jay Inslee, ended his six month long climate change-focused 2020 presidential bid in August 2019. He is seeking a third term as governor of Washington.Seth Moulton (D)Seth Moulton ended his presidential bid in August 2019 during a speech at the Democratic National Committee summer meeting in San Francisco.The decision closed out a campaign in which the candidate failed to get traction or make this year's Democratic debates.Wayne Messam (D) The mayor of Miramar, Florida, Wayne Messam, said in November 2019 he was suspending his presidential campaign.Messam failed to gain any traction in the crowded primary race and did not qualify for any of the major Democratic presidential debates. Julián Castro (D)Julian Castro ended his presidential campaign weeks before the Iowa caucus. His announcement came as Castro failed to garner enough support or donations to make the later rounds of Democratic presidential debates . The former San Antonio mayor languished around 1% in polls and lagged behind his 2020 rivals in fundraising. Castro was the only Latino candidate in the field and one of the biggest voices on immigration. Cory Booker (D)U.S. Senator Cory Booker dropped out of the race for president days before the Iowa caucus. "It’s with a full heart that I share this news — I’m suspending my campaign for president," Booker tweeted. "To my team, supporters, and everyone who gave me a shot — thank you. I am so proud of what we built, and I feel nothing but faith in what we can accomplish together."The decision came shortly after Booker failed to qualify for the January Democratic presidential debate. He needed to achieve 5% in at least four early-state polls or 7% in two early-state polls.Steve Bullock (D)Montana Gov. Steve Bullock announced that he was suspending his campaign for president in December 2019. Bullock outlined a campaign to take on money in politics and push progressive policies from his red-state perspective. Marianne Williamson (D) Marianne Williamson, an author and lecturer, ended her long-shot campaign for president in January 2020.John Delaney (D)Former U.S. Rep. John Delaney of Maryland ended his campaign for president just days before the Iowa caucus. Delaney became the first Democrat to formally declare a 2020 candidacy for president in July 2017. Delaney co-founded health care and financial companies and served in the U.S. House from 2013 until early January 2019.Joe Walsh (R)Joe Walsh, a former Illinois congressman and tea party favorite turned radio talk show host, ended a long-shot challenge to President Donald Trump for the Republican nomination in February 2020."I’m suspending my campaign, but our fight against the Cult of Trump is just getting started," Walsh announced in a tweet. "I’m committed to doing everything I can to defeat Trump and his enablers this November."Michael Bennet (D)Colorado Sen. Michael Bennet announced he would end his 2020 Democratic presidential bid after pinning the campaign's hopes on New Hampshire. Andrew Yang (D)Andrew Yang said he would suspend his campaign during a speech in New Hampshire.Yang's decision came a week after a disappointing finish in Iowa where he finished with just 1% support. Leaving the state with depleted resources, he had to lay off staff as the campaign looked to trim costs.Deval Patrick (D)Former Massachusetts Gov. Deval Patrick suspended his presidential campaign Feb. 12, 2020.He announced his candidacy in November. Previously, Patrick decided against a run, citing the "cruelty of our elections process."Patrick said he will be a candidate who will strive to unify the country."I admire and respect the candidates in the Democratic field. They bring a richness of ideas and experience and a depth of character that makes me proud to be a Democrat," Patrick said in his announcement video. "But if the character of the candidates is an issue in every election, this time is about the character of the country."Tom Steyer (D)Tom Steyer, the billionaire investor and activist, ended his campaign on Feb. 11, 2020, following the South Carolina primary.Steyer was one of the most visible and deep-pocketed liberals advocating for President Donald Trump’s impeachment. "I said if I didn't see a path to winning that I'd suspend my campaign," he said. "And honestly, I can't see a path where I can win the presidency."The businessman's decision comes after disappointing showings in the race's first three contests in Iowa, New Hampshire and Nevada. In Nevada, Steyer outspent the rest of the Democratic field on advertisements by more than $13 million.Pete Buttigieg (D)Pete Buttigieg, 38, the former mayor of South Bend, Indiana, announced on March 1, 2020 that he was ending his campaign for president.“We must recognize that at this point in the race, the best way to keep faith with those goals and ideals is to step aside and help bring our party and country together," he said in a speech to supporters in South Bend.Buttigieg is an Afghan war veteran and Rhodes scholar who was first elected mayor in 2011, at age 29. He ran unsuccessfully for Democratic National Committee Chairman in 2017.Amy Klobuchar (D)U.S. Sen. Amy Klobuchar, 58, of Minnesota, who announced her candidacy on Feb. 10, 2019, ended her campaign a day before Super Tuesday. Serving her third term, Klobuchar is on the Senate Judiciary, Rules, Agriculture and Commerce committees.Michael Bloomberg (D)Michael Bloomberg ended his presidential campaign the day after Super Tuesday and endorsed Joe Biden, closing out a costly run that saw the former New York mayor spend hundreds of millions of his own money to fund his late entry bid.Bloomberg exits the race after a disappointing showing on Super Tuesday that left him with only a single victory: American Samoa. "I've always believed that defeating Donald Trump starts with uniting behind the candidate with the best shot to do it. After yesterday's vote, it is clear that candidate is my friend and a great American, Joe Biden," he wrote in a press release.One thing set Bloomberg apart from the rest of the Democratic field: Money. The billionaire spent millions on television and digital ads to propel his campaign and quickly built a staff of more than 2,400 people by offering top dollar to a range of political operatives.Elizabeth Warren (D) U.S. Sen. Elizabeth Warren ended her 2020 presidential bid following a shallow performance on Super Tuesday, placing third in her home state of Massachusetts. After mediocre showings in the first four contests, where she never finished higher than third place, Tuesday’s results paved the way for her exit from the race for the Democratic nomination.William Weld (R)Former Massachusetts Gov. William Weld was running for president as a Republican, taking on President Donald Trump for his party’s nomination. Weld formally announced an exploratory committee on Feb. 15, 2019 at the New Hampshire Institute of Politics. Weld in 2016 was the vice presidential nominee of the Libertarian Party, running with presidential nominee Gary Johnson.Weld said in a letter March 18 to supporters that he was suspending his campaign.Tulsi Gabbard (D)U.S. Rep. Tulsi Gabbard, of Hawaii has served in the U.S. House since 2013. She made her candidacy official in an announcement in January 2019. Gabbard is a member of the House Foreign Affairs and Armed Services Committees.Gabbard announced she would suspend her presidential campaign in March 2020, after receiving two delegates in the Democratic primary. Bernie Sanders (D)U.S. Sen. Bernie Sanders, of Vermont, dropped out of his second race for the presidency on April 8, 2020. CNN and The Associated Press contributed to this report.