Last year, when the blogger and amateur gynecologist Andrew Sullivan published a Newsweek cover story proclaiming Barack Obama the liberal Ronald Reagan, conservatives mocked him. No one deserves mockery more than Sullivan—well, maybe Paul Krugman—but in this case the criticism was misplaced. On the eve of his second inauguration, we ought to face the unpleasant fact that Obama will be remembered as a president of achievement and consequence. Obama’s reversal of the Reagan revolution is here.