[17][18] Former Democratic House representatives, including Carolyn Maloney,[19] Joe Cunningham,[20] and Tim Ryan,[21] had publicly said Biden should not run.

[24][25] After Democrats outperformed expectations in the 2022 midterm elections, many believed the chances that Biden would run for and win his party's nomination had increased.

[33][34][35] Before launching his campaign, Phillips reportedly reached out to other elected Democratic officials, such as Governors Gretchen Whitmer and JB Pritzker, to convince them to enter the presidential primary race to oppose Biden, but they declined to speak with him directly.

[13][45] Biden lost American Samoa to venture capitalist Jason Palmer,[f] becoming the first incumbent president to lose a contest while appearing on the ballot since Jimmy Carter in 1980.

President Biden withdrew his candidacy on July 21, following a series of age and health concerns, writing that doing so was "in the best interest of my party and the country".

[48] By the next day, Harris had secured the non-binding support of enough uncommitted delegates that were previously pledged to Biden to make her the presumptive nominee.

Harris and her running mate, Tim Walz, would ultimately lose the election to the Republican ticket of Donald Trump and JD Vance.

[201] On March 4, author Marianne Williamson announces her campaign for the Democratic presidential nomination as the first major primary challenger to incumbent President Biden.

[212] On September 12, Speaker of the House Kevin McCarthy announces an impeachment inquiry into Joe Biden, alleging that he benefited from business dealings with his son Hunter.

[226] On December 4, Arkansas election officials rule that news personality Cenk Uygur, a naturalized citizen who was born in Turkey, could not appear on the state’s Democratic presidential primary ballot despite his argument that the 14th Amendment of the Constitution makes him eligible to run for president.

[216] And on the same day, United States Attorney General Merrick Garland appoints Robert Hur as special counsel in President Biden's handling of classified documents case.

[232] On January 18, Phillips holds campaign events in Manchester and Hanover, New Hampshire, with 2020 Democratic Primary presidential candidate Andrew Yang.

"[234] On January 22, the New Hampshire attorney general's office begins investigating an audio deepfake robocall of President Biden that encouraged people not to vote in the state primary.

[253] On March 12, President Biden wins the Georgia, Mississippi, Northern Mariana Islands, and Washington primaries, clinching enough delegates to become the presumptive nominee of the Democratic Party.

[276][277][278][279][280] On June 8, President Biden wins the Guam and the U.S. Virgin Islands Democratic caucuses, the last nominating contests of the primary cycle.

[287] Also on July 21, Representative Dean Phillips proposed a straw poll of delegates ahead of the Democratic National Convention to determine the party's top four presidential contenders, who would then take part in four town halls outlining their platforms.

[292] On July 23, U.S. House Representative Mary Peltola of Alaska's at-large congressional district and co-chair of the Blue Dog Coalition for the 118th Congress said "she has never endorsed anyone for president and does not intend to start with Harris.

[295][296][297] On July 25, U.S. House Representative Jared Golden of Maine's 2nd congressional district and co-chair of the Blue Dog Coalition for the 118th Congress told Axios he would "absolutely not" commit to voting for the Democratic presidential nominee Kamala Harris in November and is "going to wait and see what she puts forward and what her vision for the future of the country is.".

[298] On July 26, U.S. House Representative Marie Gluesenkamp Perez of Washington's 3rd congressional district and co-chair of the Blue Dog Coalition for the 118th Congress said that she has "no plans" to endorse Harris.

[302] On August 5, delegate voting closed, and Vice President Kamala Harris became the official presidential nominee for the Democratic Party.

On June 23, shortly after winning the Democratic nomination in the South Carolina gubernatorial race, former U.S. Representative Joe Cunningham told CNN that he believed Biden would be too old by the end of his second term and should not run in 2024.

[335] The New York Times reported that during his campaign, Phillips "found himself “deplatformed,” taken off the ballot in some states, and rarely invited on television to make his case.

"[338] When asserting that his campaign was hampered by ballot access policies and a lack of candidate debates, Phillips issued an apology to Bernie Sanders.

[339] Phillips said that the DNC's letter stating that New Hampshire's presidential primary was 'meaningless' and not to seat any delegates to the convention based on the results was, “one of the most egregious affronts to democracy that I’ve ever seen in my entire lifetime as an American, period.”[317] In a statement to Politico, Phillips called the handling of the primary process by the Florida Democratic Party a “blatant act of electoral corruption” and demanded Biden “condemn and immediately address” it.

In a release, Kucinich said, “The DNC wants to carry on without public and media attention.”[342] Williamson accused the Democratic National Committee of trying to “suppress” her candidacy in favor of incumbent President Joe Biden.

[343] With Biden out, on July 21, Phillips proposed a straw poll of delegates ahead of the Democratic National Convention to determine the party's top four presidential contenders.

[345][290] Following Biden's suspension of his campaign and subsequent endorsement of Kamala Harris on July 21, Williamson called for an open convention, arguing that the vice president should not be "anointed to the position of nominee.

[351] Representative Nancy Pelosi told Semafor on September 18 that Harris earned her spot atop the Democratic presidential ticket because "We had an open primary, and she won it.

"[352][353] However in the aftermath of the presidential election, Pelosi blamed Harris's loss on Biden's late exit and the lack of an open Democratic primary.

[362] All candidates registered for the ballot "in at least four states" were invited: Biden, Phillips, Williamson, Uygur, Gabriel Cornejo, Stephen Lyons, Jason Palmer, and Frank Lozada.