U.S. Rep. Connie Mack IV, the new apparent frontrunner in the GOP race for the U.S. Senate, is facing a barrage of criticism from one of his Republican rivals over congressional pay raises.

George LeMieux's campaign has claimed at least three different times -- in a press release, an online ad and in a comment from its spokeswoman -- that Mack, a four-term congressman from Southwest Florida, "voted to raise his own pay several times."

PolitiFact Florida found that examining the claim isn't so clear cut, largely because Congress probably wanted it that way. Read their analysis here.