Senate Minority Whip John Cornyn (R-Tex.) released the first television ad of his reelection campaign Monday in an attempt to shore up his image among conservative voters.

"National Journal named him the second most conservative senator in America," says the narrator of the 30-second spot. The commercial mentions Cornyn's votes against Obamacare and support for "smaller government" and a balanced budget amendment, among other things.

Cornyn has not attracted any major primary challengers yet, but he is taking the potential threat of one very seriously. The fact that he is releasing a TV ad at this early stage of the election cycle reflects this.

A Cornyn campaign aide said the ad is airing statewide, with several hundred thousand dollars behind it.