Dino Rossi is now up in last 3 Washington polls. Sharron Angle is up in the last 2 Nevada polls. Add these results to Illinois, West Virginia, Colorado, Wisconsin, Pennsylvania, North Dakota, Indiana, and Arkansas: that gets you to 51.
Of course, some of these are very tight -- especially Nevada, Washington, and Illinois. But a pattern is emerging. If a Dem is stalled at 45 or so, independents and undecideds seem to be breaking for the GOP. This has happened in West Virginia, where Raese has opened up a decent lead over Joe Manchin.
So far, GOP candidates are ahead by 5 or more in all seats they are defending.