Yes, I think Bush may have to make a move to counteract the Edwards pick. IIRC, Edwards had a respectable showing in the Ohio primary last March, even though Kerry had the nomination all but wrapped up. The Edwards selection will give Kerry a boost in Ohio, and it will be interesting to see if Bush makes a change. As much as I like Dick Cheney as a VP, he has been so demonized by the media that I believe a change (to McCain, Rice, or Guilani) may be needed, or Bush could lose this election.
Look back in history and give me a Republican candidate for President or VP who was not demonized by the media. Cheney is a winner despite the media attacks, and most Americans recognize it. Whoever it is, the media will go after them, so if you are trying to please the liberal media, you better switch parties.