I expect Edwards already built into the polls to a degree, especially here in NC where the local news has been talking as if he was the choice for the past month.
The only "proof" (the AP/IPSOS poll and the Mason-Dixon NC poll) shows otherwise. That is, they do show a measurable difference when inserting VPs (Edwards and Cheney) into the question. Note also that the AP/IPSOS poll, with its 1% Bush lead without Veeps was in pretty excellent agreement with other polls... showing Bush slightly ahead. So, by all indications, this selection is
not factored into any polls. I'm not arguing that any impact will "stick"... esp. for four long months until election day. But, nonetheless, the impact isn't in the current polls.