CHEYENNE, Wyo. — Liz Cheney, daughter of Dick Cheney, says she will challenge Sen. Mike Enzi, R-Wyo., next year.

Here’s my recent analysis of the dynamics of this no-longer-hypothetical primary race:

What makes this potential internecine contest unusual is that Enzi is generally regarded as a conservative in good standing. This isn’t a typical “RINO hunt.” He’s earned a 93 percent lifetime rating from the American Conservative Union, and has matched the average Senate Republican score from Heritage Action. Enzi recently voted against the ‘Gang of Eight’ immigration legislation. Jonathan Martin speculatesthat Cheney would run to Enzi’s right on policy issues like the internet sales tax (which has split conservatives), while quietly taking up his left flank on gay marriage. More than anything, an Enzi-Cheney race would come down to a battle over style and parochial concerns.