To be honest there should be as much consternation against Cruz as there is against Rand. However, didn’t Cruz, and Sarah, support the guy in Oklahoma - the one who got creamed? So why didn’t Cruz take a stand in this race?
At the outset of the primary season, Cruz announced that he would not get involved in any primary race where there was an incumbent.
This was done so that he wouldn't be in the position of having to support Sen. John Cornyn in his primary race -- as a favor to the Texas Tea Parties.