Well the majority of Jews support Obama so...
It makes no sense for Israel to attack Iran before the election . . it could very well backfire and get Obama re-elected. Or Obama could turn his back on Israel and Israelis could get killed for no good reason.
Better to wait until after the election. If Romney wins, the US will assist Israel. If Obama wins, they can attack the day after the election.
My guess is that the Jewish vote is 2-1 against Romney, but the Jewish donors are probably equal for Romney and Obama.
Adelson alone will be pumping about $300 million into the GOP coffers.