Donald Trump, 2012 Ross Perot
Barack Barry Hussein Steve Dunham Davis Soetoro Obama, 2012 Democrat nominee wins reelection
If it’s Trump vs Romney, Trump will win the nomination over Romney. Many conservatives will stay away from both. Republicans will go for the new guy who makes them feel good about themselves. Trump is already courting social conservatives. (Franklin Graham) Romney will never win social conservatives to make up for his loss of liberals to Trump. He’ll only get the votes of fellow elites. There aren’t enough of them to matter in elections.
So in this situation Trump will be 2012 nominee and Mitt Romney, if he goes third party, will be Ross Perot.