Which religious group is the most 'sectarian' in its voting nature?

[Verily]

This thread can't go without mentioning the awesome (in both senses of the word) super-Orthodox Jewish enclaves in New York state.  They're so damn sectarian they'll swing from 99% Republican to 90% Democratic for different races on the same ballot, almost solely based on "good for Israel."

No. Many (most?) Hasidic Jews are actually opposed to the existence of Israel, believing that the Jews must not return to Israel until the Messiah has come. They picket against things like the Israel Day Parade in NYC on a regular basis.

This is true of the Satmars, anyway (the dominant group in Williamsburg and Kiryas Joel and a large portion of the Hasidim in Borough Park). Some of the Hasidim enclaves may not think the same way, however, and would presumably be ultra-supportive of Israel.

They vote as a bloc for their own local interests (e.g., the Kiryas Joel sect will support any politician who will support their annexation of surrounding towns), and the interests of their rabbis.

[Verily]

This thread can't go without mentioning the awesome (in both senses of the word) super-Orthodox Jewish enclaves in New York state.  They're so damn sectarian they'll swing from 99% Republican to 90% Democratic for different races on the same ballot, almost solely based on "good for Israel."

No. Many (most?) Hasidic Jews are actually opposed to the existence of Israel, believing that the Jews must not return to Israel until the Messiah has come. They picket against things like the Israel Day Parade in NYC on a regular basis.

This is true of the Satmars, anyway (the dominant group in Williamsburg and Kiryas Joel and a large portion of the Hasidim in Borough Park). Some of the Hasidim enclaves may not think the same way, however, and would presumably be ultra-supportive of Israel.

They vote as a bloc for their own local interests (e.g., the Kiryas Joel sect will support any politician who will support their annexation of surrounding towns), and the interests of their rabbis.

Wow, you're right, and I had been told this before.  Hard fail on my part; sorry.

Not all of them are like that. Its just a fringe group called Neturei Karta.

Yeah, that's the first I've heard the idea that Hasidic Jews in general oppose Israel. It's a small fringe as far as I know. Most Hasidic Jews staunchly support Israel.

http://en.wikipedia.org/wiki/Haredim_and_Zionism
http://en.wikipedia.org/wiki/Haredim_and_Zionism#Groups_which_are_opposed_to_recognition_of_the_State_of_Israel

The majority of Haredi sects (divided into the Hasidic and Lithuanian branches) oppose the existence of Israel either strongly or weakly. The Satmars are the largest Haredi dynasty and oppose Israel. (Generally, the divide is an Ashkenazic/Sephardic one, with the Ashkenazic Haredim opposing Israel to varying degrees and the Sephardic Haredim supporting Israel. Shas, the ultra-Orthodox political party in Israel represents the pro-Israel Sephardic ultra-Orthodox.)

Neturei Karta is exceptionally extreme, but opposition to Israel is quite mainstream among the Hasidim.

[Verily]

I suspect that most don't especially care; they're remarkably insular communities.

Certainly it isn't a major voting issue for them. They support pro-Israel candidates regularly. I was just pointing out that they don't actively vote for pro-Israel candidates because the candidates are pro-Israel.