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Mr. Hudak said the group might have the luxury of a midterm election cycle likely to be dominated by a topic other than guns.

He said the NRA is well-positioned to pick and choose the races they want to weigh in on, and any perceived lack of participation in the elections this year isn’t a testament of weakness but a signal of strength.

“The NRA doesn’t need to primary people like it used to, because the candidates will pretty much fall in line with what the NRA wants,” he said. “Guns aren’t the issue right now. Health care is. The NRA can take a little bit of a break [and] save its money.”

The group’s continuing political strength is evidenced by a list of prominent Republican convention speakers who included Gov. Bobby Jindal of Louisiana and Gov. Mike Pence of Indiana, Senate Minority Leader Mitch McConnell, Sen. Daniel Coats of Indiana and Sen. Marco Rubio of Florida.

Other scheduled speakers included former Sen. Rick Santorum of Pennsylvania, radio host Mark Levin, Indianapolis Colts kicker Adam Vinatieri, and Milwaukee Sheriff David A. Clarke Jr.

But the NRA is also facing a growing list of challenges.

Since the Newtown school shootings, gun control advocates have moved aggressively to counter the group’s organizational strength and have counted as victories a number of gun control measures passed last year in states including New York, Connecticut and Maryland.

Americans for Responsible Solutions, the super PAC founded by former Rep. Gabrielle Giffords, Arizona Democrat, and meant in part to counter the influence of the NRA, had nearly $8 million on hand at the end of March. Former New York City Mayor Michael R. Bloomberg recently pledged to spend $50 million this year to help candidates who support his gun control agenda.

“What Bloomberg is trying to do is be the NRA from an organizational perspective, because that’s how an organization is effective,” Mr. Hudak said.

Shannon Watts, founder of Moms Demand Action for Gun Sense in America, which recently partnered with Mr. Bloomberg’s Mayors Against Illegal Guns, has conceded that a sea change on the issue won’t happen overnight but that their side of the argument needs to be heard. A new umbrella group, Everytown for Gun Safety, plans to have a presence at the events in Indianapolis.

Slightly more than a year ago, such advocates were dealt a stinging blow when federal legislation sponsored by Sens. Patrick J. Toomey, Pennsylvania Republican, and Joe Manchin III, West Virginia Democrat, to increase gun purchase background checks fell victim to a filibuster in the Senate.

Mr. Manchin, a pro-gun former governor, and Mr. Toomey are co-sponsors of Mr. Cornyn’s concealed-carry bill this year, illustrating the tightrope walk that advocates often face on the issue.

Mr. Hudak said that in terms of appearances, gun control advocates are arguably in a better place now compared with a year ago because they are not coming off a defeat as jarring as the failure of the Manchin-Toomey legislation.

“But from a substantive perspective, I don’t think the needle has moved in 12 months,” he said.