Former vice president Joe Biden led polls throughout 2019, with the exception of a brief period in October when Senator Elizabeth Warren experienced a surge in support.

[3] 18 of the 29 declared candidates withdrew before the formal beginning of the primary due to low polling, fundraising, and media coverage.

The certified results of the caucus eventually showed Mayor Pete Buttigieg winning the most delegates, while Senator Bernie Sanders won the popular vote in the state.

Sanders then won the New Hampshire primary in a narrow victory over Buttigieg before comfortably winning the Nevada caucus, solidifying his status as the front-runner for the nomination.

[4][5] Biden, whose campaign fortunes had suffered from losses in Iowa, New Hampshire and Nevada, made a comeback by overwhelmingly winning the South Carolina primary, motivated by strong support from African American voters, an endorsement from South Carolina U.S. Representative Jim Clyburn, as well as Democratic establishment concerns about nominating Sanders.

[7] Biden then won 10 out of 15 contests on Super Tuesday, beating back challenges from Sanders, Warren, and former New York City Mayor Michael Bloomberg, solidifying his lead.

[8] Between March 19 and April 7, most states in the country issued stay-at-home orders, and the overwhelming majority of campaign activity was suspended.

[10][11] Seven candidates received pledged delegates: Biden, Sanders, Warren, Bloomberg, Buttigieg, Senator Amy Klobuchar and U.S. Representative Tulsi Gabbard.

After Hillary Clinton's loss in the previous election, many felt the Democratic Party lacked a clear leading figure.

[19][20] The 2018 elections saw the Democratic Party regain the House of Representatives for the first time in eight years, picking up seats in both urban and suburban districts.

Democrats in Colorado, Hawaii, Idaho, Kansas, Maine, Minnesota, Nebraska, North Dakota, and Washington all switched from various forms of caucuses to primaries.

Only three states (Iowa, Nevada, and Wyoming) and four territories (American Samoa, Guam, Northern Marianas, and U.S. Virgin Islands) used them.

[94] Major candidates in the 2020 Democratic presidential primaries had held significant elective office or received substantial media coverage.

Nearly 300 candidates who did not receive significant media coverage also filed with the Federal Election Commission to run for president in the primary.

[95] Other notable individuals who were not major candidates terminated their campaigns during the primaries: CampaignFEC filing Other notable individuals who were not major candidates terminated their campaigns before the primaries: In December 2018, the Democratic National Committee (DNC) announced the schedule for 12 official DNC-sanctioned debates, set to begin in June 2019, with six debates in 2019 and the remaining six during the first four months of 2020.

This is an overview of the money being raised and spent by each campaign for the entire period running from January 1, 2017, to March 31, 2020, as it was reported to the Federal Election Commission (FEC).