Greg Sargent demolishes it here. Now, let's be clear -- there are some Jewish donors, Democratic ones even, that never liked Obama in the first place. They didn't donate to him the first time around, and they're not going to do so in 2012. Haim Saban falls into this category. And, what's more, I expect Obama's Jewish vote percentage to fall off, albeit modestly, from its 2012 peak. That's for several reasons: (1) 2012 won't be the rout 2008 was, (2) the economy will depress Obama's vote amongst all sectors, and (3) Republicans can't possibly be dumb enough to have someone like Sarah Palin on their ticket this time (can they?).
But with respect to the "big" story -- that wealthy Jewish Obama supporters are fleeing him in droves over his taking the mainstream American Jewish position on the Israeli/Palestinian conflict -- no, it's just not happening.