The Newsweek poll is closer to RASS if you look at the proper weightings - The only reason the Newsweek poll shows such a large lead is do to the over-sampling of REP's -
Now I do think Rass is skewed a little toward the Dem's as well - I think GWB has a 5 to 8 pt lead right now -
One item to note, though... If Ras is right, then a good number of people were turned off by Bush's speech... There wasn't a whole lot that was new, and Mon-Wed, we were exposed to GOP stars... It's just possible that people saw Bush again, and thought back to everything they've heard about him the past year (various 527s, Kennedy, Dem candidates) and many of those lies have stuck...
Unlikely, but possible.