The Obama campaign is so politically savvy that I expect they will make the VP move specifically to undercut whatever McCain does. The Dem convention is after the Reps, so why shouldn’t Obama just wait and countermove McCain?

If McCain takes Palin or Fiorina to play for the woman vote, Obama takes Clinton, McCaskel or Sebalius

If McCain take Crist or Jindal to get Florida and lock the south, Obama takes Richardson to get the Hispanic vote and lock in the West.

If McCain takes Romney for Economics, Obama takes Dodd to go toe to toe on economic issues.

If McCain makes a play for Ohio with Portman, Obama takes Rendel to lock down Pennsylvania.

If McCain takes Lieberman, Obama takes Hagel. (neither likely in my estimation – still going with the Hagel as SECDEF, Biden as SECSTATE in the Obama cabinet).

Obama will wait for McCain to move, then cut him off with a chop block at the knees.