Look, sometimes you have to accept the fact that you are going to have to rebuild from ashes. Mitt Romney is "ashes", ok? He's just not going to happen, and if he gets the nomination it's 4 more years of Obama.
Simple math: 20 people vote: 9 Democrats vote for Obama; 8 Republicans vote for Mr. X; 3 Republicans decide they can’t vote for Mr. X and don’t vote. Result, Obama wins 9-8, and 3 Republicans are smugly proud of throwing the election to Obama “on principle.”
Romney noted the differences and declared that his first act as president would be the abolition by exec order of Obamacare. What the hell exactly do you want or need???