by Patrick Appel

Nate Silver previews 2010:

While the Democrats are not extraordinary likely to lose the House, such an outcome is certainly well within the realm of possibility (I'd put the chance at somewhere between 1-in-4 and 1-in-3). The Senate picture is a bit brighter for them, but they are probably more likely now to lose seats in the chamber than to add to their majority, in spite of the spate of Republican retirements in Ohio, Missouri and other states. In a wave-type election, a net loss of as many as 4-6 seats is conceivable.

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