In July, President Obama met for 45 minutes with leaders of American Jewish organizations. All presidents meet with Israel’s advocates. Obama, however, had taken his time, and powerhouse figures of the Jewish community were grumbling; Obama’s coolness seemed to be of a piece with his willingness to publicly pressure Israel to freeze the growth of its settlements and with what was deemed his excessive solicitude toward the plight of the Palestinians. During the July meeting, held in the Roosevelt Room, Malcolm Hoenlein, executive vice chairman of the Conference of Presidents of Major American Jewish Organizations, told Obama that “public disharmony between Israel and the U.S. is beneficial to neither” and that differences “should be dealt with directly by the parties.” The president, according to Hoenlein, leaned back in his chair and said: “I disagree. We had eight years of no daylight” — between George W. Bush and successive Israeli governments — “and no progress.”

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Henry Leutwyler for The New York Times

TEAM J STREET From left: Daniel Kohl, political director; Jeremy Ben-Ami, founder and executive director; Rachel Lerner, chief of staff.

It is safe to say that at least one participant in the meeting enjoyed this exchange immensely: Jeremy Ben-Ami, the founder and executive director of J Street, a year-old lobbying group with progressive views on Israel. Some of the mainstream groups vehemently protested the White House decision to invite J Street, which they regard as a marginal organization located well beyond the consensus that they themselves seek to enforce. But J Street shares the Obama administration’s agenda, and the invitation stayed. Ben-Ami didn’t say a word at the meeting — he is aware of J Street’s neophyte status — but afterward he was quoted extensively in the press, which vexed the mainstream groups all over again. J Street does not accept the “public harmony” rule any more than Obama does. In a conversation a month before the White House session, Ben-Ami explained to me: “We’re trying to redefine what it means to be pro-Israel. You don’t have to be noncritical. You don’t have to adopt the party line. It’s not, ‘Israel, right or wrong.’ ”

There appears to be an appetite for J Street’s approach. Over the last year, J Street’s budget has doubled, to $3 million; its lobbying staff is doubling as well, to six. That still makes it tiny compared with the American Israel Public Affairs Committee, or Aipac, whose lobbying prowess is a matter of Washington legend. J Street is still as much an Internet presence, launching volleys of e-mail messages from the netroots, as it is a shoe-leather operation. But it has arrived at a propitious moment, for President Obama, unlike his predecessors, decided to push hard for a Mideast peace settlement from the very outset of his tenure. He appointed George Mitchell as his negotiator, and Mitchell has tried to wring painful concessions from Israel, the Palestinians and the Arab states. In the case of Israel, this means freezing settlements and accepting a two-state solution. Obama needs the political space at home to make that case; he needs Congress to resist Prime Minister Benjamin Netanyahu’s appeals for it to blunt presidential demands. On these issues, which pose a difficult quandary for the mainstream groups, J Street knows exactly where it stands. “Our No. 1 agenda item,” Ben-Ami said to me, “is to do whatever we can in Congress to act as the president’s blocking back.”

The idea that there is an “Israel lobby,” with its undertones of dual loyalty, is a controversial notion. It has been around since the early 1970s at least, but it became a topic of wide discussion only after the publication of a notorious article in The London Review of Books in 2006 by the political scientists John Mearsheimer and Stephen Walt. The article, which was expanded into a book, infuriated many readers by its air of conspiratorial hugger-mugger; by its insistence that Jewish neoconservatives had persuaded President Bush to go to war in Iraq in order to protect Israel; and by the authors’ apparent ignorance of the deep sense of identification many Americans — Jewish and gentile — feel toward Israel. But the authors made one claim that struck many knowledgeable people as very close to the mark: The Israel lobby had succeeded in ruling almost any criticism of Israel out of bounds, especially in Congress.