Kerry's probably screwed
Bush should be explaining why there are gaps in his record. Bush should be explaining why he claims to want government out of people's lives yet can't help meddling. Bush should be explaining why his deficit spending is necessary. Bush should be explaining but he's not. Kerry's probably screwed.
Next on the list will be Kerry's Senate record which is a weakness. People want a decisive leader but legislators aren't decisive. Legislators try to see all sides. They compromise to make deals. They vote for something distasteful in exchange for support on something they want. No legislator leaves office with a clear record. That's why Congressmen almost never get to be President while Governors cruise right in.
Kerry's service record should have been his ace. It's damaged goods now. By the time Kerry gets around to brining up Bush's lack of a service record the electorate will be tired of hearing about Vietnam. This is what happens when you pick a legislator for a candidate. Kerry's probably screwed.