Originally Posted by AmeliaG

Yup, this.

Also, Reagan ran and lost in 1968 and in 1976.

I would assume there are others.

Edit: To answer OP, Romney has no chance of being elected. If he is the nominee, the Republicans don't want to take the White House. Then again, what would really be different with a Republican administration? Are we suddenly going to have endless wars and an economy where mostly the rich the get richer and corporate welfare is the law of the land?