As one of the few Tea Party favorites to actually make it to Washington, Ted Cruz has a problem. How do you maintain outsider status while inside the Capitol? Simple: Buck leadership, advocate unrealistic hard-line positions, and refuse to help the establishment. For now, he doesn't have to choose between his base and his job.
While in New Hampshire (ahem), the junior senator from Texas told the press that, no, he wouldn't be endorsing his colleague John Cornyn in his upcoming primary. The Washington Post reports that Cruz told reporters, "I think it is likely that I am going to stay out of incumbent primaries across the country, either supporting incumbents or opposing incumbents." Cornyn didn't blink in his response to Cruz: "He and I agree that the only endorsements that matter are those of the Texas voters and I look forward to earning their vote in 2014." That's likely different in tone than any conversation Cornyn and Cruz had prior to the the latter's decision to sit on his hands.
If Cornyn were to face a serious primary opponent — which he doesn't at this point — it seems likely that Cornyn would be less sanguine about Cruz's willingness to be disloyal. Until then, Cruz doesn't have to choose between constituencies: the independence-minded Tea Party base for whom few incumbents are sufficiently conservative, and the party itself, which is willing to tolerate a little insurrection in exchange for keeping that base close.