U.S. Sen. John Cornyn has just let Texans know how seriously he views the challenge from his right.

Not very seriously at all, or so it appears.

Cornyn has released a TV spot that talks not about any of the people running against him in the March 4 Republican primary. He blasts President Obama.

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It’s not surprising, perhaps, to see this kind of strategy begin to play out. The more a powerful incumbent says about an opponent, the more publicity the opponent gets. I refer to U.S. Rep. Steve Stockman, R-Friendswood, who’s emerging as the chief primary challenger to Cornyn.

The incumbent isn’t about to give Stockman any mention at all. Why should he? Doing so elevates Stockman’s profile; it gives him attention; it provides him with grist of his own to use against Cornyn.

It doesn’t hurt that Cornyn is holding up the president as a “foe,” given Barack Obama’s unpopularity among most Texans.

The language in the ad is harsh. In my view it’s overly harsh, but that’s just me.

However, it makes for extremely smart politics from John Cornyn.