And does that make that comedian, Jon Stewart — despite all his protestations that what he does has nothing to do with journalism — the modern-day equivalent of Edward R. Murrow?

Certainly many supporters, including New York’s two senators, as well as Mayor Michael R. Bloomberg, played critical roles in turning around what looked like a hopeless situation after a filibuster by Republican senators on Dec. 10 seemed to derail the bill.

But some of those who stand to benefit from the bill have no doubt about what — and who — turned the momentum around.

“I don’t even know if there was a deal, to be honest with you, before his show,” said Kenny Specht, the founder of the New York City Firefighter Brotherhood Foundation, who was interviewed by Mr. Stewart on Dec. 16.

That show was devoted to the bill and the comedian’s effort to right what he called “an outrageous abdication of our responsibility to those who were most heroic on 9/11.”

Mr. Specht said in an interview, “I’ll forever be indebted to Jon because of what he did.”

Mr. Bloomberg, a frequent guest on “The Daily Show,” also recognized Mr. Stewart’s role.

“Success always has a thousand fathers,” the mayor said in an e-mail. “But Jon shining such a big, bright spotlight on Washington’s potentially tragic failure to put aside differences and get this done for America was, without a doubt, one of the biggest factors that led to the final agreement.”

Though he might prefer a description like “advocacy satire,” what Mr. Stewart engaged in that night — and on earlier occasions when he campaigned openly for passage of the bill — usually goes by the name “advocacy journalism.”

There have been other instances when an advocate on a television show turned around public policy almost immediately by concerted focus on an issue — but not recently, and in much different circumstances.

“The two that come instantly to mind are Murrow and Cronkite,” said Robert J. Thompson, a professor of television at Syracuse University.

Edward R. Murrow turned public opinion against the excesses of Senator Joseph McCarthy in the 1950s. Mr. Thompson noted that Mr. Murrow had an even more direct effect when he reported on the case of Milo Radulovich, an Air Force lieutenant who was stripped of his commission after he was charged with associating with communists. Mr. Murrow’s broadcast resulted in Mr. Radulovich’s reinstatement.

Walter Cronkite’s editorial about the stalemate in the war in Vietnam after the Tet Offensive in 1968 convinced President Lyndon B. Johnson that he had lost public support and influenced his decision a month later to decline to run for re-election.

Though the scale of the impact of Mr. Stewart’s telecast on public policy may not measure up to the roles that Mr. Murrow and Mr. Cronkite played, Mr. Thompson said, the comparison is legitimate because the law almost surely would not have moved forward without him. “He so pithily articulated the argument that once it was made, it was really hard to do anything else,” Mr. Thompson said.

The Dec. 16 show focused on two targets. One was the Republicans who were blocking the bill; Mr. Stewart, in a clear effort to shame them for hypocrisy, accused them of belonging to “the party that turned 9/11 into a catchphrase.” The other was the broadcast networks (one of them being CBS, the former home of Mr. Murrow and Mr. Cronkite), which, he charged, had not reported on the bill for more than two months.

“Though, to be fair,” Mr. Stewart said, “it’s not every day that Beatles songs come to iTunes.” (Each of the network newscasts had covered the story of the deal between the Beatles and Apple for their music catalog.) Each network subsequently covered the progress of the bill, sometimes citing Mr. Stewart by name. The White House press secretary, Robert Gibbs, credited Mr. Stewart with raising awareness of the Republican blockade.

Eric Ortner, a former ABC News senior producer who worked as a medic at the World Trade Center site on 9/11, expressed dismay that Mr. Stewart had been virtually alone in expressing outrage early on.

“In just nine months’ time, my skilled colleagues will be jockeying to outdo one another on 10th anniversary coverage” of the attacks, Mr. Ortner wrote in an e-mail. “It’s when the press was needed most, when sunlight truly could disinfect,” he said, that the news networks were not there.

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Brian Williams, the anchor of “NBC Nightly News” and another frequent Stewart guest, did not comment on his network’s news judgment in how it covered the bill, but he did offer a comment about Mr. Stewart’s role.