Great choice, but I hope we don’t depend on the assumption that Mr. Biden is stupid. He isn’t, and neither is anyone else who becomes a senator, or a governor, or even a mayor of a town of a few thousand souls.

But Mr. Biden is misguided in his beliefs. Furthermore, he has obvious personal weaknesses that can be exploited in the debates. I feel sure a sitting governor can tempt him to overplay his hand. One observes that Mr. Obama has already overplayed his own hand.

That’s all it takes to win. I have students who can win the conservative side of these debates.