I venture a guess that the percentage of conservative Jews is about the same as the percentage of conservative blacks. Too bad.
Not if you include the Orthodox. You can be African-American and conservative about many things and still vote Democrat. But that's quite not the case with Jews. Still there's usually only about a 10 percentage point difference in the Jewish (high 70s) and Black (high 80s) vote for Democrats. Reagan did better than usual among Jews (over 30%). Obama did better than usual among African-Americans (over 90%).