Oversampling of Republicans in this poll.
In the RV internals, Bush is up by 80 among Republicans, Kerry up 74 among Dems, that's a 2-point edge for Bush. Kerry up 3 among independents. If the GOP and Dems were sampled equally, Bush would be up by 1 point. Instead he's up 4 points. As others have said, don't trust the Gallup poll or the Newsweek poll, both have been all over the map due to sloppiness.