“When it came to personal interactions with Jews or issues that had an impact on Jews, Lincoln did the right thing, on every occasion,” Harold Holzer, a prominent Lincoln scholar . . . said in an interview. . . . “I myself have a regard for the Jews,” Lincoln reportedly said. . . . My chiropodist is a Jew, and he has so many times ‘put me on my feet’ that I would have no objection to giving his countrymen ‘a leg up.’ ”