President
Joe Biden sent a letter on December 1, 2022, to the
Democratic National Committee (DNC), requesting that "diversity" should be emphasized in the
2024 Democratic Party presidential primaries, shifting Iowa's traditional status of the first state to hold a caucus. A December 2022 vote by the DNC Rules and Bylaws Committee the following day approved the change. On February 4, 2023, the DNC approved a new 2024 primary calendar, moving South Carolina to hold its race first on February 3. Iowa, which traditionally goes first, would then be held later in the primary season. Members of the
Iowa Democratic Party and the
New Hampshire Democratic Party opposed the move, since they would no longer be the first two states to hold their races. Lee Saunders, a member of the Rules and Bylaws Committee who was in favor of the change, said that adjusting the calendar will give a truer representation of the composition of the country. Under normal circumstances, the
Iowa caucuses operate very differently from
primary elections used in most other U.S. states. Instead of going to polling places to cast ballots, Iowans instead gather in-person at local caucus meetings to discuss and vote on the candidates, which are typically held at selected schools, churches, public libraries, or even individuals' houses. In response to the chaotic
2020 Iowa caucuses and the DNC's new rules and calendar, the Iowa Democratic Party initially planned to allow voting-by-mail for the first time, hoping to gain a better spot on the primary calendar through closely abiding by the new rules and enlarging their voter base. They speculated that in doing so they could take the spot of another planned early state that would have failed to meet the date expected by the DNC. However, in early June 2023, the Republican-controlled
state legislature and Iowa Governor
Kim Reynolds signed a new bill into law requiring the caucuses to be held in person in order to force Iowa Democrats not to follow the DNC plan and to secure Iowa's first-in-the-nation status. Iowa Democrats then wanted to hold the caucus in person, select delegates and complete party business, fulfilling the law, while they would still organize the presidential preference vote by mail-in cards and only declare the official results during the later timeframe sanctioned by the DNC. However, on October 6, the DNC and the Iowa Democratic Party reached a different compromise in which the in-person caucuses could still be held in January, but delegate-determining voting were held
through the mail until
Super Tuesday, March 5. ==Opinion polling==