If he wishes to stay in politics he can endorse Trump sooner or later.
In Newt Gingrich's convention speech, Newt wisely gave Cruz an out by explaining how Cruz actually did endorse Trump with his “vote your conscience” and held up that fig leaf for Cruz to grasp.
All Cruz needs to do is reach out and grab the fig leaf Newt held up for him and “clarify” his endorsement of Trump with minimal damage to his political career and minimal loss of dignity and humiliation.
If Cruz remains obstinate, he will eventually be forced to go crawling on his knees to publicly beg Trump to accept his endorsement and his apology to save what is left of his political career.
He probably will not be savvy enough to grasp the fig leaf so generously offered to him by Newt Gingrich.
Don't expect Cruz to take the easy out for the good of the country and the Republican Party.
As Paul Manafort has observed, even after Ted Cruz has finally managed to hammer the absolute last nail in his own coffin, Cruz steadfastly refuses to realize and accept that he is in the coffin, much less take the necessary measures to extricate himself from his own self nailed coffin.
This is a fatal and dangerous personality flaw for an man who wishes to President of the United States, Leader of the Free World and Commander In Chief of a Super Power military with his finger on the nuclear button.
It’s pretty close to being a certifiable nut job, really. I’ve seen it before and it is not pretty.