Some Democrats also previously complained about his age, but the party has no alternatives now. With less than a year until election day, the Democratic Party has no apparent backup plan if it decides to part with its endorsed candidate. Choosing a candidate to run against or replace Biden would also likely be a tremendously messy process: Would the party want to go with its current vice president, Kamala Harris, California Gov. Take Michigan, the next state on the calendar to host its Democratic primary on February 27. In a worst-case scenario, the latest the Democratic Party would've been able to insert a new candidate on the ballot was December 8, 2023, or about two months ago.