Well, I think it matters if a person is following a false prophet whose word takes precedent over scripture. Such is the case with Adventists. That was a concern with Romney, as well.
Mark Levin is a conservative Jew; de facto, then, he doesn’t acknowledge the divinity of Christ or the inspired nature of the New Testament - both of which SDA’s do. Yet there is no man I wish to the office of president more than he. Surely you feel at least somewhat in agreement with that, or am I wrong? If not I hope you can point out a difference, because I’m not really seeing one.