Neither he nor his parents were born in this country. Could he be just a little jealous that Ted Cruz has one parent who fulfills the eligibility and Tribe doesn't?
One other thing - the Great Lawrence Tribe has NEVER defended the Constitution as a professor nor as a lawyer arguing his cases in front of the Supreme Court.
And some people think he should be listened to?
Rather obvious if looking at some of his history:
Because he's just another Harvard liberal hack who hates Conservatives. That's why. You don't know that by now?