Obama is already one of the most consistently polarizing presidents of the last 60 years. His current campaign strategy, win or lose, will deepen our national divisions.

. . . All of the atmospheric elements of politics — unity, bipartisanship and common purpose — are significantly worse than four years ago. This is not all Obama’s fault. But he is choosing — in a campaign so nasty, so early — to make it worse. At some point, ruthlessness just leaves ruins.