Larry Sabato updates his predictions:

We noted before Labor Day that whenever the House has flipped parties since World War II, the Senate has changed party control in the same direction, even when election observers didn’t see it coming. If the Senate falls into the GOP column in 2010, it will do so right at the end of the campaign by a relative handful of votes in a couple of states. The closest contests are in Colorado, Illinois, Kentucky, Nevada, Washington, and West Virginia. To take control of the Senate, Republicans must win all of these seats, or pull off an unexpected upset in Connecticut or California. Again, it would have been a lot easier for the GOP with Delaware in hand.

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