If Trump win on the Iowa caucus,GOP primary will be over.Reagan did not participate on his last GOP debate and lost the Iowa caucus, still he became the President.Smart move by the two GOP Presidential candidate(Huckubee and Santorum), they knew that if Trump win,Trump will still depend on his GOP opponents to fill-up his cabinet. Obama only hope to continue his legacy is Clinton to win. This is my opinion, onced Obama feels that Clinton has no chance of winning against Trump, Obama has two option to do, he will declare Martial Law or create a world war3 senario. Therefore there will be no election and remain as the President forever.