“What in Cruz’s background makes him qualified to be president?”
Cruz’s deep respect and knowledge for the Constitution. The oath of the President of the United States is to Protect and Defend the Constitution against all enemies, both foreign and domestic.
Ted Cruz has defended our Constitution many times before the Supreme Court, and there is no one in the race as imminently qualified to keep that oath.
I love Cruz. He is “qualifed” to be President. (I do fear the eligibility issue...). But certainly in terms of the service that he has rendered to the country and its Constitution, he is more qualified than any elected official.