Not really -- or not necessarily. It must be about 20 years ago that Dershowitz had a regular column that the Boston Herald used to run. On most subjects, it was infuriating liberal pap (though more literate than most). On Israel, however, he was always spot on!
Not so reliable on Judaism. Didn't he have a book some years ago, proposing a "Judaism without God"? -- he wanted some kind of animating and unifying Jewish identity, but he's not religious (no, I never read it, but I think I saw reviews). To my Catholic ear, it sounded like a call for "Judaism without Judaism." Talk about bricks without straw!