That may be because of the Likudnik campaign as you see -- but I think a more benign expanation is likely: Jewish immigrants could integrate much better in the USA than various non-whites, thus the choice between the xenophobic and the non-xenophobic party is a less important dimension in the newer generations.

It's not simply blind allegiance.

I'm not sure linca meant it as such.

_{*Lunatic*, n.
One whose delusions are out of fashion.}