Well Cruz is finished so they might as well stand behind Trump because the alternative is the end of the country. Hillary or Sanders wins, that will be the death knell. Cruz today accused Trump of planting the story about Cruz having affairs with 5 women, he called Trump not a liar, a RAT. So in other words he is admitted it, the guy is done, he is cooked, put a fork in him.
It was really scummy of Cruz to blame Trump, but how is doing so admitting to having the affairs?