In case you're wondering, Rep. Joe Barton (R-Texas) does have a Democratic challenger. 

His name is David Cozad, and while his website is pretty underwhelming, all of the attention on Barton's apology to BP CEO Tony Hayward — which he has since retracted — has some progressives, at least over at Daily Kos, asking who Cozad is.  

"I don't have a high-dollar campaign just yet," Cozad told the Ballot Box. "But I've got a camera, two or three staffers and we're putting together a video response for the website." 

One of Cozad's first reactions when he heard Barton's comments: "I thought of Jane Fonda going to Hanoi," he said. "The way he said it just reminded me of that sort of abject apology."

On his website, Cozad calls himself a "Green Dog Democrat" with a plan to create green jobs for the 6th district. 

The notion that Rep. Barton might be vulnerable, regardless of Democratic outrage over his comments, is far-fetched. Texas' 6th district is heavily Republican. 

—Updated at 5:48 p.m.