Powerful allies of President Biden are aggressively working to stop third-party and independent presidential candidacies, fearing that an outside bid could cost Democrats an election that many believe will again come down to a few percentage points in key battleground states.
As attempts to mount outside campaigns multiply, a broad coalition has accelerated a multipronged assault to starve such efforts of financial and political support and warn fellow Democrats that supporting outsider candidacies, including the centrist organization No Labels, could throw the election to former President Donald J. Trump.
Mr. Biden’s top aides have blessed the multimillion-dollar offensive, which cuts across the party, tapping the resources of the Democratic National Committee, labor unions, abortion rights groups, top donors and advocacy groups backing moderate and liberal Democrats. Even the president has helped spread the word: Mr. Biden, in an interview with ProPublica, said a No Labels candidacy would “help the other guy.”
The endeavor is far-reaching. In Washington, Democratic allies are working alongside top party strategists to spread negative information about possible outsider candidates. Across the country, lawyers have begun researching moves to limit ballot access — or at least make it more costly to qualify.