Karl Rove:

Biden has 35 years in the Senate, yet his record on national-security issues during that span has been atrocious. He might be able to name Germany's chancellor, but he was wrong in his fierce opposition to Ronald Reagan in the 1980s and to the surge in 2007. Even Democrats don't see Biden as president. He got 0.9 percent of the vote in the Iowa caucuses. Forced out of the 1988 White House race for plagiarizing, he is that blend of longevity and long-windedness that Washington accepts as statesmanship.

Only Biden, as Charles Krauthammer put it in Fred Barnes's piece this week, can make "seven errors in 60 seconds" responding to a question on a topic - foreign policy - on which he is supposedly an expert.