Prominent conservative David Barton will not primary John Cornyn.

We discussed this technique ideologues in each party use to pull candidates to either extreme and simultaneously punish moderates.

From the National Review:

Controversial Evangelical author David Barton just announced that he won’t challenge Senator John Cornyn in the 2014 Texas Senate primary. On Glenn Beck’s radio show this morning, he told Beck’s listeners that, though the primary is “winnable,” the timing isn’t right for him.

“What can I do to talk you into this?” asked Beck, disappointed.Texas tea-party activists had been hankering for Cornyn to get a primary challenger ever since he removed his name from Mike Lee’s letter urging his Senate colleagues to refuse to support a CR that funded the Affordable Care Act. But finding a candidate with the requisite name recognition, connections, and willingness was a tall order.

Now they are looking for Louie Gohmert to run

Esquire wonders why this is happening.

There's a whole book out now on the subject of primarying.