It won't happen. Romney is a professional candidate and you have to remember 40-45% of the country goddamn hates Barack Obama and will vote against him no matter what; the number for Obama is something like 25-30%. The remainder mostly kind of like Obama. If Romney can sway them (which he should be able to do if he has more money), than he can win, a landslide.
Can you please tell me more about the future? I know it might screw with the time-stream but I'd really like to know some things and now you've really got me curious.