There’s a nice guide to flip-flopping in the New Republic.

Do you remember when conservatives used to speak warmly, and sometimes rapturously, about Barack Obama? That was back when they were certain that the Clinton voodoo magic would make Hillary the nominee, and Obama her sympathetic roadkill. Since then, the right has made the horrifying discoveries that Obama is, successively, a left-wing ideologue, a coddler of anti- Americanism, a wine-sipping elitist, and, now, a shameless flip-flopper. The man will say anything, discard any position, in order to win the election.