According to Rasmussen Reports:

Republican candidates now have an eight-point lead over Democrats, their biggest lead of the year, in the latest edition of the Generic Congressional Ballot.

The new Rasmussen Reports national telephone survey shows that 44% would vote for their district’s Republican congressional candidate while 36% would opt for his or her Democratic opponent. Support for GOP candidates held steady over the past week, but support for Democrats slipped by a point.

Perhaps this helps to explain why Parker Griffith, a freshman congressman from northern Alabama, is expected to announce today that he is switching parties. Elected as a Democrat, he is switching to the GOP because of unhappiness with national Democratic policies. Several other Democratic congressmen in swing districts have announced that they will not seek reelection next year.

A lot can happen in a year.  But 2010 might not be a good year to run as a Democrat.