Can you say impeachment?

Looks like Bush will be flogging 2006 races with the fear of the damned. Brendan Nyhan estimates the GOP could lose as many as 47 House seats, and likely will lose at least 36, based on Bush’s current poll ratings.

So GOP Congressional candidates are going to be running away from Bush's negative coattails at exactly the moment he needs to campaign for them to win so the Dems don't get control of both Houses.

However, a linked Washington Post article offers this caveat:

But Republicans have expanded their majorities in Congress in each of the last two elections, and strategists expect, at a minimum, that Democrats will narrow those margins next year. A Democratic takeover of either the House or Senate is not out of the question.

And, Nyhan doesn’t speculate on whether or not Democrats will regain control of the Senate. Without that, this prediction, if it should come true, while being relatively good news, would still be of modest size.