MCMAHON/CARSON: This CBS News poll shows that a Kerry/McCain ticket runs a great chance of beating Bush/Cheney. (Adding McCain to the ticket doubles Kerry's chances of winning.) I know this holds true for me -- you add McCain, and I'm on board. But I keep thinking: Shouldn't it be McCain/Kerry? I mean, Kerry/McCain is too much like Barney and Fred to me. The wrong guy gets top billing.