At the very least that’s what the Foley scandal has been. From the NBC/Wall Street Journal poll (I’m pulling these numbers from the Hotline):

Bush as Pres.

Approve 39%

Disapprove 56%

Has What You’ve Seen/Heard Over Past Few Weeks Make you ____ About Dems Becoming Majority in Cong.?

More favorable 34%

Less favorable 23%

No effect 37%

Has What You’ve Seen/Heard Over Past Few Weeks Make you ____ About GOPers Maintaining Cong. Majority?

More favorable 18%

Less favorable 41%

No effect 35%

Here’s the release for the poll.