I just got this off Huffpo and thought I'd drop it over here.
Apparently in response to a letter by one of her constituents about the testimony of Oil execs back in '05, the congresswoman sent a letter to one of her constituents thanking them for their inquiry. At the end of the letter there is a nifty little tagline... "I think you're an asshole".
The letter can be viewed here
The article is here