Numerous polls suggest that support for Israel is weakening among Democratic voters. Among Democrats, sympathy for Israel is weaker than it was before Mr. Netanyahu took office in 2009. A Gallup poll from earlier this year asked voters whether they were inclined to support Israel or Palestine and found that just 43% of Democrats are partial to Israel. That’s the lowest number in 14 years. A recent Data for Progress poll found that 65% of Democratic voters support conditioning military aid to Israel in response to its human rights record. An October report from the centrist Center for American Progress ended up with an even higher number when they posed the question: 71% of Democratic voters support such a move.