In the 11/06 midterm election, 87% of self-identified Jews voted Democratic.
Then, in March, 2010, during an Israeli state visit, "Obama snubbed Netanyahu for dinner with Michelle and the girls, Israelis claim - Benjamin Netanyahu was left to stew in a White House meeting room for over an hour after President Barack Obama abruptly walked out of tense talks to have supper with his family, it emerged on Thursday. . . . It was the second time this month that Mr Netanyahu has been at the receiving end of a US dinner-time snub. A fortnight ago, Joe Biden the US vice president, arrived 90 minutes late for a dinner Mr Netanyahu hosted in Jerusalem . . ."
Yesterday, in the 11/10 midterm election, only 66% of Jews voted Democratic.
Cause and effect? Maybe not. But, by their obnoxious behavior and incompetent job performance, Obama and Biden have managed to alienate approximately 25% of one of the most reliably Democratic voting blocs in America.