He is smart, poised, quick minded, and presidential. A leader and not a follower. Others have picked up on issues that Ted Cruz was leading on for a while now. The Johnny-come-latelies know that Ted knows the hot button issues.
Most of all, Ted is the only one knowledgeable and willing to steer the ship of state back along constitutional paths.
None of the others have the smarts or the will to bring the state machinery back to the constitution. It is simply not a priority for them for multiple reasons.
If you feel that liberties are being eroded, and you want that to change. You should back Ted Cruz.