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“I have no qualms about telling you, yes, it was [a mistake],” Mr. Shaath said. “It was not supposed to have gone military, and it did get out of hand. We are much more careful this time around.”

Mr. Saidam, the Abbas adviser, posited that a third uprising could be “an electronic intifada,” citing this week’s hacking attack on Israel’s stock exchange and national airline, as well as Facebook campaigns calling for the boycott of Israeli goods.

“When I talk about a third intifada, I’m not advocating, nor am I anticipating, a repetition of the scenes of the past,” he said. “It will be a clever, more technology-based approach.”

Mr. Saidam and others said their pessimism about the peace process springs from their belief that Mr. Netanyahu’s right-wing government is not as serious about peace as its center-left predecessor.

Many Palestinian officials pine for the days of Yitzhak Rabin, the Israeli prime minister who helped create a framework for peace with Palestinian leader Yasser Arafat in the 1993 Oslo Accords. Rabin was killed by an Israeli extremist three years later.

“We always say, if Rabin was alive, we would have been in a different situation completely,” said Issa Kassissieh, deputy head of the Palestine Liberation Organization’s negotiation affairs department. “He was the only one that was able to strike a deal with the Palestinians. He had a vision.”

Officials said they also think that Mr. Obama will not pressure Mr. Netanyahu as much in an election year as he did at the beginning of his term.

“My great letdown is how rapidly this administration backed down when it came to Israel, whether on the settlements or on anything else,” said Hanan Ashrawi, a longtime Palestinian spokeswoman and lawmaker. “We saw how principle and values were abandoned so quickly in favor of narrow self-interest.”

Ms. Ashrawi said she was “alarmed because we’re seeing the end of the two-state solution.”

“There are already enough Palestinians who are saying it’s too late already — that these settlements have done enough damage to prevent a viable, contiguous Palestinian state,” she said. “I’m getting to the borderline of saying it’s no longer possible. … I think 2012 is the end.”