Every new Kerry vet who supports him, every critical story of the Swiftvets, every attack on Bush's "connection" to the ads---every one of these merely keeps the story alive an adds to the sense in some peoples' minds that "something is fishy." But wait! It gets even better: Let's say you're a voter not sure whether to believe the Swiftboat vets' ads or not, at the very least what they have done is to obliterate two years' worth of groundlaying by the Dems with the "Bush lied" mantra. At the very worst, uninformed voters now say, "They both lied." (I know, this is ridiculous, but try to think like an uninformed voter for a minute). If "they both lied," then Kerry has to have some hugely appealing traits or programs that would convince people to abandon an incumbent, and he doesn't! So at the very least, the Swiftboat vets---and the unintentional support they got from the media---destroyed the entire pre-Dem Convention strategy of the last two years! It's a beautiful thing to watch.
It's going to get better.