In large measure, I think the markets have "priced in" the Edwards pick.
I think the closer you are to North Carolina, the more it is priced in, the further away, the less it matters.
Kerry will get a modest bump in the polls - simply because the media has something "new" to cover and the Kerry/Edwards combo will get alot of free media out of it.
I think both Bush and Kerry will both get far smaller bumps from their conventions than is typical, just because the electorate is so tuned in, so early this year.
The next batch of polls we see are not a particularly good crop - I think we are due for another LA Times poll and a Zogby soon, and these will show an exagerated Kerry bump, but I think the "real" polls will likely show maybe a 4 ish% Kerry bump that fades in two weeks or so.
In the end, the VP pick, unless it is a total disatser does not matter a whole lot IMHO.
Kerry gets a week of nice media coverage. A good thing, but in the end, not a game breaker one way or the other
I agree with Mr. Garner
The Vice Presidency isn't worth a warm bucket of spit" John Nance Garner - 32nd Vice President