Dwayne Stovall, one of Cornyn's several primary challengers, released the ad last week. He chides Cornyn for taking votes that would hurt Texas, saying they would "enslave its children with unconstitutional laws and overwhelming debt."
"And you certainly don't do all this," Stovall tells the camera as a split-screen of McConnell and a cartoon turtle pop on the screen, "to please some guy who looks and fights like a turtle."
A Texas county's Tea Party Straw Poll found Stovall in the lead for the GOP nomination with 42 percent of the 70-some votes. Cornyn earned just 18 percent.
The full ad is below: