Jewish support for Hitler and the Nazi party dates back to the earliest days of the movement. The most prominent group was the Association of German National Jews. They believed they could convince the Nazis that they were Germans first and Jews second, and they even agreed with the Nazi persecution of Ostjuden (Russian Jews). Contemporaries joked that at Nazi rallies, the group would shout "Down with us!" Their leader was Max Nauman, who supported the Nazis right up until he was sent to a concentration camp in 1935.
The Nazis never courted any Jewish groups as a cover to "prove" they weren't antisemitic. They never touted anyone as their Jewish friend to deny accusations. Hitler said things like "With satanic joy in his face, the black-haired Jewish youth lurks in wait for the unsuspecting girl whom he defiles with his blood." And yet the Association of German Jews somehow still thought that hey, maybe this guy isn't so bad after all.
Even Hitler's personal chauffeur, SS officer Emil Maurice, was Jewish according to the Nazi racial laws. He had to be declared an "honorary Aryan" to stay a Nazi. But none rose higher than Erhard Milch, a field marshal in the Luftwaffe. He had a Jewish father, which the Nazis lied about, claiming he was instead the product of incest. You know it's bad when "No no, he's just inbred!" is the preferred explanation.