From Public Policy Polling, a firm that typically surveys for Democrats but often has solid numbers:
PPP's newest Florida poll, conducted completely after the Republican convention, finds no change in the Presidential race there. Barack Obama leads Mitt Romney 48-47, exactly as he did on our last poll of the state five weeks ago.
The Republican convention being held in Tampa appears to have been a wash. 33% of voters say it made them more likely to vote for Republicans, 33% said it made them less likely to vote for Republicans, and 34% said it didn't make a difference to them either way.
Romney did see a slight bump in his favorability numbers. 49% of voters have a positive opinion of him to 47% with a negative one. That +2 spread is up a net 5 points from late July when his breakdown was 46/49.
The rest of the speakers at the convention seem to have been more of a hit with voters. Condoleezza Rice's numbers in particular stand out. 66% of voters see her favorably to 22% with a negative opinion. That's up a net 13 points from our last poll when she was already pretty darn popular at 59/28. Even with Democrats Rice comes in at 47/36. Another star from the convention is Ann Romney. 56% of voters give her good marks to 22% with an unfavorable opinion and she comes close to breaking even with Democrats at 32/39.
Clint Eastwood's speech may have drawn more attention than anything else that happened at the convention and it didn't go over particularly well with voters. 36% say they have a favorable opinion of his remarks to 41% with a negative opinion. While Eastwood's speech didn't do much to help Romney it doesn't seem to have hurt his own reputation either. 72% of Floridians have a favorable opinion of him to 11% with a negative one and even with Democrats the spread is 58/20. Those are certainly numbers any politician would die for.
The biggest winner of the convention on the Republican side may have been Marco Rubio. He now has a 51% approval rating with 33% of voters disapproving of him. Those are the best numbers PPP has found for him since he took office. He is pretty universally beloved by GOP voters at 85/11 and even with Democrats he has a 26% approval rating, more crossover support than we usually find for folks these days.