Washington ? The National Rifle Association’s threat to punish senators who vote for Supreme Court nominee Sonia Sotomayor has been met with a shrug by Democrats from conservative-leaning states and some Republicans who are breaking with their party to support her.

The gun rights group is used to getting its way by spooking lawmakers about the political consequences of defying its wishes. But it never before has weighed in on a Supreme Court confirmation battle. It was cautious about breaking that pattern, and it looks like it’s losing a fight to defeat President Barack Obama’s first pick for the court.

Sotomayor is expected to easily win confirmation in a vote this coming week that could deflate the long-accepted truism in Washington that you don’t cross the NRA.

Voting “yes” will include A-plus-rated and NRA-endorsed Democratic Sen. Max Baucus and his fellow Montanan, A-rated Sen. Jon Tester, as well as A-rated and NRA-endorsed Tennessee Sen. Lamar Alexander, the only GOP leader to break with the rest of this party to back Sotomayor.

That’s not to say that the NRA’s late decision to wade in hasn’t had an impact.

Many Republicans who were considered possible “yes” votes for Sotomayor — including Utah Sen. Orrin Hatch, Georgia Sens. Saxby Chambliss and Johnny Isakson, and Texas Sen. Kay Bailey Hutchison — have come out against her after the NRA’s announcement, citing gun rights concerns as an important reason.

Some Democrats who have high NRA ratings, including Alaska Sen. Mark Begich and Nebraska Sen. Ben Nelson, are on the fence.

Still, the NRA’s threats seem to hold less potency on this vote. Asked whether he was worried about ruining his perfect NRA score and endorsement by opting to vote for Sotomayor, Nelson paused and said with a smile, “I’d probably have a good rating regardless.”

The NRA derives much of its considerable clout from what has become a kind of mantra on Capitol Hill: Defy the gun lobby on something it cares about and face recriminations at the polls; back it and enjoy a substantial political boost.

It’s something of a self-fulfilling prophecy. Lawmakers generally are terrified to test it, and the NRA is politically savvy about which issues it takes on. Its won-loss record adds to its reputation as untouchable.

So why would the gun lobby risk undercutting its clout by stepping into this Supreme Court debate?

GOP leaders, particularly Sen. Mitch McConnell of Kentucky, the Senate’s top Republican, helped forced the group’s hand.

At the conclusion of the Senate Judiciary confirmation hearing for Sotomayor two weeks ago, the NRA came out in opposition to her, calling her “hostile” to the Second Amendment right to bear arms. But it stopped short of saying it would include the vote on her confirmation in its political ratings.

In a later meeting on Capitol Hill with Republican senators and conservative activists, McConnell asked if the group planned to “score” the confirmation vote. The NRA was noncommittal.

Accounts of the meeting vary, and McConnell’s aides deny that he leaned on the NRA to rate the Sotomayor vote. But others present or briefed later on the session said it was clear that McConnell and other leaders wanted the NRA’s scorekeeping. They spoke on condition of anonymity because they were not authorized to detail the private exchange.