Fox is "tweeting" (?) that Florida governor and Senate hopeful Charlie Crist will run as an independent. This will be remembered as another indicator of the political mood of the time - a mainstream, recently popular governor was swept aside in the primary by a "tea-party" Republican to his right.
It seems unlikely that a 3-way race would hand the election to a Democrat, as happened in New York's congressional race, as Democrat Kendrick Meek presently polls in the low 20's. But Crist is still a solid second behind Rubio in the general election polling.
Crist is rowing against the stream as a 3rd party candidate. The outsider has just claimed the high-ground after a successful siege of the establishment. The internal revolution is over, and Crist lost. Now the wider war begins - and Crist's odds don't seem much better.