Tellingly, the pleas for recounts have gained no support from the Clinton campaign, which has concluded, along with outside experts, that it is highly unlikely the outcome would change even after an expensive and time-consuming review of ballots.

But that has not quieted Mrs. Clinton’s supporters, who see the inequity of her growing lead in the national popular vote, which is now more than two million votes, or 1.5 percent of all ballots cast, according to the nonpartisan Cook Political Report, which regularly updates its count as states continue to tally and to certify votes.

Since there is currently no effort to review the paper ballots — which exist in Michigan and Wisconsin, but only in parts of Pennsylvania — conspiracy theories about the 2016 election may live on for years. After United States intelligence agencies accused Russia of trying to influence the election by stealing and publishing emails from the Democratic National Committee and a range of other institutions and prominent individuals, the United States went on high alert to determine if there was any attempt to sabotage the vote count. So far, no one in the Obama administration has indicated that there is any such evidence.

In the three battleground states, Mrs. Clinton is behind by 1.2 percent or less, and the final results have not yet been certified.

Uniting around the social media hashtag #AuditTheVote, the campaign-after-the-campaign has picked up momentum among grass-roots activists still mourning Mr. Trump’s victory and who echo, paradoxically, his pre-election complaint that the vote was “rigged.”