From this Jewish Republican viewpoint, I'd say that American Jews are really tending more toward the right as Obama turns increasingly against Israel and as his domestic policies prove detrimental to the lives of Jews and others. It's not such an "overwhelming" advantage for the left compared to what it once was.
Remember that the figures quoted in the posted article were done by exit polling and relate only to House candidates in the one particular district the interviewee happens to vote. Remember also that the polling is done by left-leaning groups with biases in that direction. I for one can't understand how you can get a reasonable random sample of exit poll interviewees that can represent the American Jewish community as a whole, given the very few election precincts that the pollsters can be working as compared to the whole.
Then, too, disproportionately more of these Jewish voters would be in House districts that are overwhelmingly 'rat, so much so that the GOP candidate for House, who may not even exist, would not put up much of an effort and would not be sufficiently recognized and known. Even furthermore, these pollsters, because of their biases and because of social and language barriers, would likely be interviewing disproportionately fewer Republican Jewish voters, who would represent higher percentages among the subgroups of Orthodox and newer Russian immigrant Jews and their families. All these factors would tend to increase the reported Democrat % of the Jewish vote for House candidates so as to make it a few points higher than the real number.
Garbage in, garbage out, at least to some extent.
J Street released a poll that stated that Jews agree more with Obama than Netanyahu, but it is J Street that did the poll; therefore, I don’t believe it or anything else they say.