I just realized it now, after all my obsessing over the coming election: I know why Barack Obama wants to be president, it is so clear watching him debate.  Watching John McCain debate, I'm at a loss.  Why does he want to be president?  There is no clear answer: and that speaks to his floundering, wayward campaign, his erratic responses to issues, and his odd debate performances.  I don't think he knows why.  He has some knowledge, but little purpose.  He has experience, but no wisdom.  Underneath it all, that's "why" McCain will lose and Obama will win.