The picture Crist tweeted of himself appears to show him holding up some sort of party registration form.
Crist was a one-term Florida governor, from 2007-2011. And when he lost the Republican primary for Senate in 2010 to Marco Rubio, he decided to switch parties and become an independent. So he ran the 2010 election as an independent, but lost anyway by 19 percentage points.
In the 2012 presidential election, Crist was a supporter and surrogate for President Barack Obama.
There is much local speculation that with Crist's move to the Democratic party, he's gearing up for another state-wide run for office.
"The widely expected move positions Crist, 56, for another highly anticipated next step: announcing his candidacy for governor, taking on Republican incumbent Gov. Rick Scott and an untold number of Democrats who would challenge him for the Democratic gubernatorial nomination," reports the Tampa Bay Times.
St. Petersburg, Fla. Tony DiMatteo, a state Republican party committeeman from Pinellas County, introduces to a packed house at the Tick Tock restaurant a number of local GOP activists here to support Newt Gingrich. Included are a few who worked early for Marco Rubio’s 2010 U.S. Senate campaign, back when, DiMatteo points out, Rubio “could not win.”
“Just like Newt could not win a couple of weeks ago,” he adds.
On two occasions over the past week, former president Bill Clinton attempted to persuade Democratic congressman Kendrick Meek to drop out of the Florida Senate race and endorse Republican-turned-Independent Florida governor Charlie Crist in the three-way contest. Clinton, who had campaigned for Meek twice in October, was acting with the knowledge – and presumably the blessing – of the Obama White House.
Another poll shows Marco Rubio sitting pretty with a double digit lead over Charlie Crist. As for the rumors that Meek might drop out and endorse Crist and turn this into a real race? Left-wing blogger Markos Moulitsas, who had been pushing for Meek to do just that, now says that Democrats "are actively boosting" Meek's "pretty much a hopeless candidacy" because Meek will help boost African-American turnout, and thereby help Democrats win the critical Florida's governor's race. Moulitsas's new line is a sign that Democrats don't think they have much of a shot of winning even if Meek endorsed Crist.
Florida GOP Senate candidate Marco Rubio has a comfortable 15-point lead, according to a new Mason-Dixon poll, which shows independent Gov. Charlie Crist and Democratic Rep. Kendrick Meek are stuck in the 20s, battling for second place. Last night ABC News hosted a Florida Senate debate with the three candidates (you can watch it here), and neither Crist nor Meek appeared to do much to weaken Rubio's standing.