But Nassau has a more observant Jewish population than most places, so I'm not so sure you can simply plug in the national Jewish vote figure for Nassau Jews.
This is generally true, though certainly depends on the area. Plainview, Jericho, Roslyn, southern half of Great Neck are all heavily Jewish and staunchly Democratic. The northern portions of Great Neck, especially in the Kings Point area have a strong Russian and Persian Jewish population and have swung heavily Republican. The Five Towns region also use to be heavily Democratic and as swung Republican, especially Lawrence, which is heavily Orthodox.