I don't think so. Paraphasing of couse, but I've heard Keyes say many times that our unalienable rights come from God and that no government can deprive us of same. I think it would go against his deeply held religious beliefs to say otherwise.
Some folks need to understand that L Tribe seems to be on crack, and we don't need to his leftist radicalism as a measuring stick for our common sense constitutional conservatism.