It's on: Rubio and Crist to debate on Meet the Press, Fox News Sunday

Nationally televised debates are rare for a state-level primary. In this case, the appearances reinforce how dramatic the Florida race has become. Crist entered the race as the overwhelming favorite only to see Rubio, with support from conservative activist, steadily gain ground.

Almost as much as Democrats, Crist, who supported the stimulus package, has become a victim of Tea Party populism.