A new Rasmussen Reports statewide telephone survey of likely Florida voters has Rep. Connie Mack (R-FL) leading Sen. Bill Nelson (D-FL) by a 46 to 37 percent margin. Seven percent prefer some other candidate, and 10 percent are undecided.

The numbers were flipped back in April when Nelson had a 47 to 36 percent lead over Mack. At that time, Mack still had heavy competition for the GOP nomination, with then-candidate George LeMieux’s lobbying attacks on everything from Mack’s past run-ins with the law to his missed votes.

Mack draws 86 percent support from voters in his own party, while Nelson is backed by just 66 percent of the state’s Democrats. But the silver lining for Nelson is that he leads by nine points among Florida voters not affiliated with either major political party.

The survey of 500 Likely Voters in Florida was conducted on July 9, 2012, and has a margin of error of +/- 4.5 percentage points.

Meanwhile, American Crossroads, a Super PAC run by Karl Rove, confirmed that they have reserved $6.2 million in air time to attack Nelson’s record. ”He has a long record that makes him vulnerable,” said spokesman Nate Hodson.

Tags | American Crossroads, Bill Nelson, Connie Mack, George LeMieux, Karl Rove, Nate Hodson, Rasmussen Reports