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If Democrats are reluctant to show heavy support for Israel, it may be because they’re in a political bind. Polls over past month show that Democratic voters are taking an increasingly dim view of Israel.

Polls consistently show that a majority of Americans support Israel, but the partisan divide is deep.

A Gallup poll released Monday found that 65 percent of Republican voters agreed that “Israel’s actions in the current Middle East conflict are justified.” Only 31 percent of Democrats and 36 percent of independent voters agreed.

A Pew Research Center survey released in mid-July found that 60 percent of Republicans believe Hamas is responsible for the outbreak of violence. Just 29 percent of Democrats blame Hamas and 26 percent blame Israel. Only 13 percent of Republicans say Israel is responsible.

The Pew survey also found that 73 percent of Republicans sympathize with Israel, up from 68 percent in April, while Democrats sympathizing with Israel slipped from 46 percent to 44 percent.

A CNN poll released July 21 showed 73 percent of Republicans and 45 percent of Democrats say Israel’s military actions in Gaza are justified.

“At a time when Israel is clearly engaged in an existential conflict, fighting for its right to exist, it is disappointing that Democrats in this country do not share the same high level of support for Israel that is seen among Republicans,” Matt Brooks, Republican Jewish Coalition executive director, said in a statement.

Democratic ambivalence

Still, Democrats don’t appear worried, at least not this year. Jewish voters showed weaker support for Mr. Obama in the 2012 election, but they still turned out for him over Republican Mitt Romney by a margin of 69 percent to 30 percent, according to Pew.

Democrats also win on optics: House Majority Leader Eric Cantor, the only Jewish Republican in either chamber of Congress, is preparing to resign after losing his primary race in Virginia.

The National Jewish Democratic Council issued a statement after Mr. Cantor’s loss inviting “those who feel unrepresented by the Republican Party to join us in supporting the 33 Jewish senators and members of the House who proudly serve us in Congress.”

Mr. Silverman, a former Democrat who is now unaffiliated, said Democrats need to show they deserve Jewish support by taking a stronger stand for Israel.

“More Jews still vote, and run for office, as Democrats,” said Mr. Silverman. “There is ominous slippage of support for Israel amongst Democrats. Democratic elected officials, and Jewish Democrats, need to decide whether they will still stand up strong and publicly for the Jewish state.”