Which fan base do you think is more Republican? Giants or Jets? 49ers or Raiders? Yankees or Mets?
Yankees v. Mets
I agree that geography tells us that Mets fans are probably more Republican. But something tells me that it's much closer than you might think at first. I know 3-4 NYC Jews (Democrats, of course), all of them Mets fans. Apparently, Jews supported (overwhelmingly) Brooklyn Dodgers and remained NL fans when Mets franchise was founded. There is ton of celebrity Jewish Mets fans - Philip Roth, Jerry Seinfeld, Elena Kagan and many other I can't remember right now. OTOH, every Italian I have met from NY metro area is a Yankee fan and I think most of them are Republicans or at least right-leaning.