Crist made the announcement on Twitter late Friday night, including a picture of him holding up a Florida voter registration form with his wife, Carole.
“@charliecristfl: Proud and honored to join the Democratic Party in the home of President @BarackObama!”
The Tampa Bay Times reports he signed the papers switching his party affiliation from Independent to Democrat at a White House holiday party.
Crist, who has formerly referred to himself as a “Reagan Republican” and “Jeb Bush Republican,” was elected to that state’s highest office in 2006 as a member of the GOP. His record in the state was fairly moderate; on one hand he espoused tough-on-crime rhetoric, spoke against same-sex marriage, opposed progressive gun control laws and raising taxes. But he was also an advocate for higher teacher pay and passed legislation mostly in favor of abortion rights, despite labeling himself as pro-life.
Read more at ABC News.