Donald Trump, who claimed his endorsement gave Mitt Romney victory in Nevada, told CNN he was perplexed about Rick Santorum.

Said Trump: "Rick Santorum was a sitting senator who in re-election lost by 19 points, to my knowledge the most in the history of this country for a sitting senator to lose by 19 points. It's unheard of. Then he goes out and says oh 'okay' I just lost by the biggest margin in history and now I'm going to run for president. Tell me, how does that work? ... That's like me saying I just failed a test. Now I'm going to apply for admission to the Wharton School of Finance. Okay? He just failed a test.... And now he's going to run for president. So, I don't get Rick Santorum. I don't get that whole thing."