A new analysis of polling data matching party and religious affiliation has reignited a decades-old debate over whether Jews are abandoning the Democrats, jeopardizing the party’s electoral prospects in races up and down the ballot.

The Pew Forum on Religion and Public Life released a report on Thursday showing that the 52-point advantage Democrats held with Jewish voters in 2008 has dropped 16 points. Fewer American Jews are identifying as Democrats or saying they lean Democratic at the same time that more are siding with the Republican Party.

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