Trump is a pretty smart guy. He recognizes that there are many more subjects than citizens of this republic. He realizes that Obama won because he was a novelty. He knows the Governator and the Body were novelities too. He believes that if he wins the GOP nomination, he wins, because the citizens in the GOP want Obama out by any means necessary, and the subjects(the ones who call intellectual reading, the National Enquirer, the most widely read paper in the South, btw) will vote for Trump as a novelty. He believes that if he does not win the GOP nomination, but the GOP puts up a centrist, he has a punchers chance. He has nothing to lose and everything to gain.