Kerry just gave a major speech on Iraq. I expect that this will be his focus over the next 40-something days.
Interestingly, he looked good in the speech. If someone started to pay attention to the campaign with this speech (and therefore ignored all of the events that shed light on Kerry's character, his flip-flops on Iraq, his failure to attend meetings of the Intelligence Committee, etc.), that latecoming voter might think that we are about to have a serious presidential campaign between two stand-up guys on the issues.
At this point, though, I think that Kerry will be unable to hide from his past. Too many people know.
If nothing else, maybe there will be a rational debate between the candidates, one where kerry pins himself down to one position on a subject (like what's he done in the senate lately?).