Re-establishing the primacy of the Constitution is part of what made me support him in the first place. This was his time to step up and say "I put my hand on the Bible and said that I would defend and uphold the Constitution, so help me God. I am charged with this duty. While I am confident that the Supreme Court would strike down this bill, my job is to prevent unconstitutional bills from becoming law in the first place. I am charged with that duty; it is my charge to keep. And America, when I said a promise made is a promise kept, I meant it."
Heck, he had all the language set up. It would have been a powerful reaffirmation of Constitutional principles. And he pissed it away.