You can oppose President Obama because you believe he’s wrong. You can oppose him because you believe he’s evil.
The most acute division on the right — the one that will give Mitt Romney the most trouble — is not between moderates and hard-core right-wingers, between electability-minded pragmatists and ideologues, or between the Tea Party and the Republican establishment. It is between those Republicans who disagree with Barack Obama, believing his policies to be mistaken, and those who hate Barack Obama, believing him to be wicked. Mitt Romney is the candidate of the former, but is regarded with suspicion, or worse, by the latter. The former group of Republicans would be happy merely to win the presidential election, but the latter are after something more: a national repudiation of President Obama, of his governmental overreach, and of managerial progressivism mainly as practiced by Democrats but also as practiced by Republicans.
It is unlikely that those seeking a national act of electoral penance for having elected Barack Obama are going to get what they are after. For one thing, the number of Americans who believe President Obama to be merely incompetent is far greater than the number of Americans who believe him to be, not to put too fine a point on it, evil. For another, that larger group of voters is, for once, probably right.