Another prominent Republican has endorsed the favorite Senate candidate of Tea Party activists in Florida.

Rep. Eric Cantor, R-Va., has now joined former Gov. Mitt Romney, R-Mass., and others in supporting state House Speaker Marco Rubio, R-Fla.

It is yet another sign of the impact of the Tea Party movement on this year's elections.

Could Rubio win?  Click play for an update with CBN News White House Correspondent David Brody.

Before the Tea Party rallies, Gov. Charlie Crist, R-Fla., might have gone unchallenged. But now Crist is thinking about quitting the GOP and running as an Independent.

After holding a big lead in the polls, Crist now trails conservative Rubio by more than 20 points.

Last week, Crist vetoed an education bill popular with conservatives and his own campaign manager quit in protest. Crist has until the end of April to decide if he will leave the Republican primary and run as a third party candidate.