What to expect from tonight's debate

The McCain campaign is already promising victory in tonight's debate, but I think this excerpt from Politico is more likely to be the story of tonight's debate:

...the candidate's penchant for the dramatic has also raised anew potentially damaging questions of his age, executive abilities and, most of all, his temperament.

McCain's attempt to shift the argument from the economy to character has, perversely, given Democrats an opening to question his own fitness to lead. Spur-of-the-moment decisions - from his choice of a running mate he hardly knew to his request that the first debate be delayed - reflect an impetuousness he's tried to associate with Obama's youth, his critics say, while undercutting his argument that he's a cool, tested old hand capable of coping with presidential pressure."