He did not endorse Romney. But he is wrong about Myth, he most certainly is like Charlie Crist but worse.
He did hammer Newt for his anti-Romney ads but was quite okay with the flurry of anti-Gingrich ads in FL by Romney.
http://race42012.com/2012/01/25/rubio-rips-gingrich-again/
NO ONE is worse than Charlie Crist, well, except maybe Arlen Specter.....