Your definition of what a "Conservative" is and mine are obviously different. Cruz will not endorse the RINO Cornyn. PERIOD! Why? Because Cornyn is a RINO. A harry reid boot licker. An establishment "republican". NOT a "Conservative." Here in Texas there are several candidates running for Cornyn's seat EVERY candidate is claiming to be a "Conservative." It's ridiculous. Only one or two may be "Conservative" the rest know that they are toast if they cannot convince the weak minded that they are Conservative.
You ask why Cruz won't endorse boot lickers? Where were the boot lickers when Cruz was fighting like crazy to win his seat in the Seat? I'll tell you. They were fighting just as hard to defeat him. He remembers and so do we. ;-)