From Haaretz, in an article behind a paywall:
Steven M. Cohen, a prominent sociologist of American Jewry and director of the Berman Jewish Policy Archive at New York University said it was important to put the Jewish vote in context with the trend of a downturn of support for Obama among the broader white vote in the election. Obama’s share of the white vote dropped from 43 percent in 2008 to 39 percent in this election, mostly because of the economy. “Whites votes for Obama dropped by four percent and Jewish vote for Obama dropped by five percent. Statistically that means there is no difference. And compared to whites, Jews are just as firmly in the Democratic camp as they were in 2008,” he said, citing a Workman’s Circle survey released in July that he conducted that indicated Jews make their voting decisions primarily based on views on economic justice and social inclusion.
If you're a Haaretz subscriber, you can read the rest of the article here: Sibling Rivalry: American Jews spar over the meaning of the Jewish vote