I would guess that most are Roosevelt or Kennedy-Democrats (like my grandmother and mother, respectively), but vote independently. Almost everyone I know voted for McCain, but I think that has more to do with geography than ethnicity. Then, there's the old-timers and zips who don't vote because they feel the U.S. government can't do anything for them.
There were over 160,000 votes on Staten Island.
We voted for a Democratic congressman this year. And an Irish guy at that! We all know the circumstances though.