The challenge of these debates is that Biden can't quite say, "I'm always in the mainstream of the Democratic Party, so when I was wrong, Bill Clinton, Nancy Pelosi and Barack Obama were wrong too, so it's less bad." And he seems unwilling to say that he evolved on various issues. But Sanders harping on votes from 20 years ago doesn't quite work without him really connecting that to the future -- Sanders says Biden got the war in Iraq wrong, but what does that say about what issues he might get wrong in the future? I have watched all these debates, and Sanders hasn't quite communicated this to me.