“Everyone is now going to have to pick a side,” said Jeremy Ben-Ami, the president of J Street, a liberal Jewish lobby that has supported Mr. Obama’s positions on Israel and is hosting its annual conference this weekend. That included the woman at “the forefront” of the Democratic Party, he said, who would undergo “more and more pressure.”…

Jewish elected officials in the Democratic Party describe a nightmare scenario in which traditional supporters of Israel will receive primary challenges from candidates now openly critical of the Israeli government. Polls show that Israel is increasingly unpopular with African-American, Latino and young voters — a key portion of the Democratic base. Officials fear that an erosion of support for Israel in the party could cause insecurity among Jewish voters, forcing them to seek comfort in the eager embrace of the Republican Party.

This is the stuff of dreams for Republicans. For them, and especially the party’s neoconservatives, Mr. Netanyahu’s victory was a good omen.

“It will strengthen the hawkish types in the Republican Party,” said William Kristol, the editor of the Weekly Standard, who said that Mr. Netanyahu would win the party’s nomination, if he could run, because “Republican primary voters are at least as hawkish as the Israeli public.”