Florida Sen. Marco Rubio endorsed Mitt Romney for president Tuesday night on Sean Hannity's show on Fox News. "I am gonna endorse Mitt Romney. He offers such a start contrast to the president's record," the senator said. "I have zero doubt in my mind: No. 1 that he will govern as a conservative, and No. 2 that he will be head and shoulders above the president in the White House right now." On rumors he's on the short list to be vice president, Rubio said,"I don't believe I'm going to be asked ... that's not what I want."