Gallup goes inside it's latest polling results in the presidential race pitting President Bush against Sen. John Kerry. (Bush leads Kerry by 12-13 points).

It finds that the greatest number of Bush supporters will vote for the President because he's doing a good job and they're satisfied with his performance.

The greatest number of Kerry supporters, Gallup finds, are voting for the senator because he's not Bush.

It's not exactly a shock (that's what exit polls at the Iowa caucuses found was the reason for much of Kerry's support back in January.) Still, it will be interesting to see how successful Kerry's supporters are on Nov. 2 with a stratgegy of - as Zell Miller put it - "against, against, against."