deep-pocketed and powerful Christian legal group Alliance Defending Freedom. He chimed in approvingly: “Let me just say, ‘Amen,’” he said.

Also throwing its weight behind the campaign is the influential Heritage Foundation and its political arm, Heritage Action for America, which recently announced that it planned to spend millions of dollars to support voting policies that are popular with conservatives. Those include laws that would require identification for voters and limit the availability of absentee ballots, as well as other policies that Heritage said would “secure and strengthen state election systems.”

Several Republican strategists said that while the “stolen” election canard was accepted widely among rank-and-file Republican voters, they were surprised to find how deeply it had taken hold with major donors, who seem the most convinced of its truth and eager to act.

Groups that are fighting these attempts to restrict ballot access said that the organizing on the right was so new that its impact had been hard to gauge. Michael Waldman, the president of the Brennan Center for Justice, said Republican legislatures seemed to understand the power of this issue on their own and didn’t need much persuasion to act.

“Are we seeing a lot of new lawsuits, new lobbying, other things on the ground?” he said. “The answer is mostly no. We’re seeing a lot of fund-raising.” Still, the number of groups involved and the salience of the issue was striking, he said.

“There’s massive organizational infrastructure behind it,” Mr. Waldman said. “It’s hard to identify too many unifying issues right now in the Republican Party. But this seems to be one of them.”

As contentious as some of the past conservative-led campaigns to restrict voting were, this time is even more emotionally and politically charged given how closely associated it is with Mr. Trump and the Jan. 6 riot at the Capitol that he incited. Some conservatives said the association with that day complicated what could be relatively uncontroversial changes to regulate how absentee ballots are sent out, collected and counted now that so many more people are likely to request them in the future.

a range of changes: Some would regulate mail-in voting at the margins, like requiring that ballots are mailed out no earlier than three weeks before the election and received by the time polls close on the day of.

Others would no doubt be more controversial, like banning the organized, third-party collection of ballots that conservative critics call ballot harvesting.

Mr. Snead said it was problematic that the 2020 election and its aftermath had cast a shadow over the entire issue. “There’s definitely a recognition that we don’t want this to be something that is tied to the last election,” he said. But as someone who started his work on election law before Mr. Trump was elected and shares the broader goal of establishing more conditions on voting, he acknowledged that the environment had never been riper.

“It has risen to a degree of prominence it probably has never enjoyed,” Mr. Snead said.

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