Romney is inevitable? Really?

Serious question here. Everybody says Romney is the only one who can beat Obama. Just heard Levin earlier talking about a Gallup poll that shows if an election between Obama and Romney was held today, Obama wins 45%-44%. A narrow win, but still a win. Digging deeper into the results, of those voting for Obama, 74% were voting FOR him and not against Romney. Of those voting for Romney, something like 58% were voting AGAINST Obama and not for Romney. Still think he is inevitable? He is after all the guy who lost to the guy who lost to Obama the last time around.