So its fine for Cruz to effectively give aid and comfort to the Clintons, by piling on Trump? Let Don Lemon and Rachel Maddow do that; Cruz took the pledge, unless he wants to live up to the name Lyin Ted.
How did he "pile on"? He was asked a question; he gave an honest answer.
He then refused to go any further; characterize it as "racist", etc. That would've been piling on...and Cruz avoided doing that.
Thing is, when your guy makes a mistake, you shouldn't try to defend it. Accept it...and move on.