For Grover Norquist's Taxpayer Protection Pledge, the latest rebellion began last week in the South, by way of friendly fire.

"I care more about my country than I do about a 20-year-old pledge," Sen. Saxby Chambliss, R-Georgia, told Macon station WMAZ. "If we do it his way, then we'll continue in debt, and I just have a disagreement with him about that."

The next shot came from South Carolina's Sen. Lindsey Graham: "I think Grover is wrong when it comes to we can't cap deductions and buy down debt....I will violate the pledge, long story short, for the good of the country."

More Republican salvos followed. Rep. Peter King of New York said the hard line on revenue was based on outdated thinking: "A pledge you signed 20 years ago, 18 years ago, is for that Congress" -- not an entire congressional career.

Sen. Bob Corker, R-Tennessee, insisted he was "not obligated on the pledge." House Majority Leader Eric Cantor downplayed the pledge's significance, saying no one in his home state cared all that much about it. Sen. Jeff Sessions, R-Alabama, sounded a similar note: ''Oh, I signed it,'' he said. "But we've got to deal with the crisis we face. We've got to deal with the political reality of the president's victory.''

The man behind the pledge says he's not so much embattled as bored.

"I've seen this movie about 50 times before," he told CNN. "I get this every time someone burps. It always gets reported as all these guys have caved and said they're for tax increases. All it is happens to be a handful of people are having impure thoughts," he said, turning to his favorite recent description of the trend.

Take last year, when Rep. Mike Simpson, R-Idaho, sounded a defiant note.

"I signed (the pledge) in 1998 when I first ran. I didn't know I was signing a marriage agreement that would last forever," he told Fox News. "And I think that the majority of members of Congress understand that you have to have additional revenue."

And back then, Rep. Frank Wolf, R-Virginia, one of the half-dozen Republicans who hadn't signed the pledge, took direct aim at Norquist from the House floor.

"I believe how the pledge is interpreted and enforced by Mr. Norquist is a roadblock to realistically reforming our tax code," he said. "Have we really reached a point where one person's demand for ideological purity is paralyzing Congress to the point that even a discussion of tax reform is viewed as breaking a no-tax pledge?"

In other words: Over the years, semiregular flashes of Norquist defiance have tended to be one of those Washington obsessions that grab big headlines to little permanent effect, sort of like open-mike profanity on the campaign trail.

One or more Republican lawmakers will appear to publicly waver on their commitment to the pledge. (Norquist points to Chambliss, Graham and King as repeat offenders.) That open questioning is often followed just as predictably by a private call to Norquist -- who says Chambliss has called to apologize -- and more often than not, some kind of public mea culpa.

Norquist, 56, has never been elected to public office or held a Cabinet post. He isn't a deep-pocketed donor or celebrity magnate. The millions of dollars Americans for Tax Reform, the group he heads, spent on the 2012 campaign is a healthy sum, but pocket change in the post-Citizens United era. Norquist may have had influence over the direction of super PAC funding, but he didn't hold the purse strings.

And yet he's routinely named one of the most powerful men in Washington. He hosts off-the-record weekly meetings of the conservative movement's top figures. The "K Street Project" he pushed during the Bush era was a leading driver of a massive shift in the lobbying landscape to the GOP's benefit. And the Taxpayer Protection Pledge he debuted more than two decades ago has achieved an almost mythic status among fans and foes alike.

Norquist views that two-line document -- fewer than 70 words in all -- as something like a blood oath, an ironclad, immutable contract between lawmakers and their constituents that they will not back any bill to raise taxes or revenue.

Famously, he keeps original copies of every signed pledge -- each of which has to be co-signed by two witnesses -- in a fireproof vault for protection. This congressional session, that safe held the signatures of nearly every Republican member of Congress, as well as some Democrats.

Norquist warns lawmakers who, in his view, turn wobbly on taxes that they're risking their political lives -- including Republican icons like Indiana Sen. Dick Lugar, who lost both Norquist's backing and his primary race to Richard Mourdock this year.

Mourdock, of course, went on to lose a near-guaranteed Republican Senate seat to Democrat Joe Donnelly by nearly six points, despite Mitt Romney's solid Indiana win at the presidential level.

There are some who say the zeitgeist has shifted in some tangible way during the current Congress. Last year, 40 Republicans joined 60 Democrats as co-signers of a letter that expressed a willingness to consider revenue increases as part of a deficit solution. And amid the latest GOP pushback, the wave of "Is Grover Over?" headlines has been mounting.

Norquist himself often speaks with the casual confidence of a Washington fixture, secure in the knowledge that his position is far more secure than any elected official's.

"We are not auditioning for fearless leader," he told activists at this year's Conservative Political Action Conference. "We don't need a president to tell us in what direction to go. We know what direction to go... We just need a president to sign this stuff. We don't need someone to think it up or design it."

It was the sort of remark liberal critics often point to as evidence Norquist is a conservative puppet master with near-limitless power. One artist recently depicted him as the Wizard of Oz, an unseen but seemingly omnipotent force (a portrait Norquist himself jokingly embraced, retweeting a link to the picture with the caption: "My mom wants one.")

Earlier this year, President Obama complained to Rolling Stone magazine that some Republicans would like to work with him, but "in an atmosphere in which folks like Rush Limbaugh and Grover Norquist are defining what it means to be a true conservative, they are lying low."

When Norquist last year slammed bipartisan efforts to end pricey ethanol subsidies as a backdoor tax hike, former President Clinton mused that it seemed GOP moves had to be "approved in advance by Grover Norquist."