A new Mason-Dixon poll in Florida shows that Gov. Charlie Crist (R) continues to lead former House Speaker Marco Rubio in the U.S. Senate race. But Rubio is gaining in the polls as he becomes more familiar to state voters.

Republican Primary Election Matchup
Crist 51 (-2 from May)
Rubio 23 (+5)
Undecided 26 (-3)

In the May survey, 56 percent of Republican voters did not recognize Rubio. That number is down to 48 percent in the past month. Among voters who recognize both candidates, the race is much closer: Crist leads with 33 percent, with Rubio at 31 percent and 36 percent undecided.

On the Democratic side, Rep. Kendrick Meek (D) still leads in what is a much more fluid race. The May survey tested Meek against state Sen. Dan Gelber, who has since decided to run for state Attorney General. Fellow U.S. Rep. Corinne Brown (D) has since suggested she will run.

Democratic Primary Election Matchup
Meek 27 (+1)
Brown 12 (N/A)
Undecided 61 (+3)

Crist wins easily in a general election matchup against both candidates, though his numbers have slipped from a May matchup against Meek.

General Election Matchup
Crist 48 (-7)
Meek 26 (+2)
Undecided 26 (+5)

Crist 55
Brown 24
Undecided 21

The survey of 625 registered voters was conducted June 24-26, and had a margin of error of +/- 4 percent. Each primary subset was of 300 likely primary voters, with a margin of error of +/- 6 percent.