| Quinnipiac (4/8-13, registered voters, 1/20-24 in parentheses):
Charlie Crist (R-inc): 33 (44)
Marco Rubio (R): 56 (47)
Undecided: 10 (8)
Kendrick Meek (D): 24
Marco Rubio (R): 30
Charlie Crist (I): 32
Kendrick Meek (D): 38 (35)
Marco Rubio (R): 42 (44)
Undecided: 17 (19)
Kendrick Meek (D): 34 (36)
Charlie Crist (R): 48 (48)
Undecided: 14 (12)
A whole lot has happened in the last 24 hours since this poll from Quinnipiac came out. I'm not sure if seeing this poll was Crist's "fuck it" moment, or if he'd already decided to act, but yesterday he took a sorta-bold step back on the path toward independence that he once walked: Crist vetoed legislation passed by Florida's GOP-held legislature, near and dear to conservative hearts, that pushed merit pay and limited teacher tenure. His veto is a thumb in the eye to the local GOP establishment, and probably ends any remaining vestigial possibility of him winning the Senate primary against right-wing darling Marco Rubio.
The reaction from the rest of the state's GOP was pretty swift: he lost endorsements from state legislators almost immediately, NRSC chair John Cornyn (who'd previously sheepishly stuck by his Crist endorsement) started warning Crist about getting any ideas about straying off the reservation, and by the end of the day, Crist had lost his campaign chair: Connie Mack (the former Sen., not the current Rep.).
Rumors were flying this morning that Crist advisers were now pivoting toward an independent run, or else dropping out altogether and moving toward a 2012 run against Bill Nelson. And just hours ago, despite having made a Shermanesque statement last week about an indie run, Crist said something that the media is running with as an indication that the indie bid is imminent: in response to questions about an indie bid, he said, "I'm not thinking about that today. We'll look at that later on." Not quite political oratory on the order of "We having nothing to fear but fear itself," but certainly a provocative question mark. (Although with the filing deadline coming up within weeks, "later on" can't be much later.)
In the event the indie bid happens, Quinnipiac shows that the GOP near-slam-dunk turns into a three-way frenzy where Crist, Rubio, or even Dem Kendrick Meek have a credible shot. Interestingly, Quinnipiac also finds that Meek has been gaining on Rubio in the head-to-head (down only 4), as Meek works his tail off under the radar (as seen with his unnecessary, but framework-building petition gathering scheme) while Rubio's right-wing leanings may be getting more apparent to the casual viewer. So, whether or not this turns into a three-way race, the Dems need to watching this one closely.
UPDATE: I'm not sure if this was planned or the veto was the last straw, but Mitt Romney, about as establishment a GOP figure as you can get, just endorsed Marco Rubio in this race.