Mason-Dixon for Sayfie Review/PowerPlay (3/30-4/1, registered voters):
Alex Sink (D): 35
Bill McCollum (R): 36
(MoE: ±4%)
It seems like not that long ago we were looking at a potential Florida senate race between CFO Alex Sink and AG Bill McCollum. With Gov. Charlie Crist sounding more and more like he's moving to switch over to the Senate, causing the lower ranks on Florida's political totem pole to gravitate over to the governor's race, we may now be looking at a Sink/McCollum FL-Gov race instead, and that's what Mason-Dixon just polled. (In fact, if those numbers look vaguely familiar to you, it's because Quinnipiac did a head-to-head poll of a Sink/McCollum FL-Sen matchup in mid-January, and that poll also found McCollum 36, Sink 35!)
Mason-Dixon didn't poll head-to-heads on a Crist-centered Senate race (either GOP primary or general). However, they did ask whether voters would "consider" voting for him, for which the answers were 17% definitely, 50% consider, and 26% definitely not. There is one note of caution for Crist here, though: he gets an 18% "definitely not" from Republicans (compared with a 35% "definitely not" from Democrats). That could point to a very competitive primary with a more orthodox conservative opponent. With former House speaker Marco Rubio intent on staying in the race and highlighting Crist's stimulus-loving ways, it seems likely Rubio will be that opponent.
http://www.swingstateproject.com/diary/4721/flsen-flgov-mccollum-leads-sink-by-1-for-governor