Florida Gov. Charlie Crist's (R) supporters are apparently no longer content to sit back and watch Marco Rubio narrow the gap in their Senate primary.

They have gone up with a website, TruthAboutRubio.com, looking to put a dent in Rubio's sterling reputation among Republicans (44 percent positive, 3 percent negative in one recent poll). Rubio has come within 15 points of Crist in a recent poll after trailing big early on.

It's an acknowledgement of Rubio's traction, for sure, but also proof that Crist's supporters aren't going to take this primary sitting down.