I would also add this. This advertisement has the potential to cause real problems for Bush. First, it motivates the Dems to bring up Bush's Vietnam service. Yes, we all know it's a crap issue, but it may regain political legs and be a thorn in Bush's side. And if that's the case, then it may dampen the negative impact of the ad, and make it difficult for Bush to make the case that Kerry's Senate record proves he's unfit for duty.
Let's face it, as Kerry's Dem convention speech made clear, Kerry would love nothing more than to keep the focus off his Senate record.
I have heard this position put forward but I don't know if I buy it. One of Brit's all-stars said that, if the "war records" were compared, Kerry comes out on top.