Is Republican candidate for the U.S. Senate Marco Rubio becoming a threat to the seemingly invincible Florida Gov. Charlie Crist, also seeking a Senate seat?

Rubio, the more conservative candidate of the two, has won all nine straw polls that GOP county executive committees have conducted in the state – including one in Palm Beach County last night, where he won 90-17. Palm Beach County was one of the first urban areas in Florida to conduct a straw poll – where Crist would be expected to have more of an advantage.

But the Palm Beach Post reports that those GOP committee members are a pretty conservative bunch – the base, you might say – and these straw polls don’t mean that Crist has a lot to worry about. Crist led Rubio in a recent Rasmussen poll 53-31.