Outside Groups Pledge Over $1 Billion to Aid Biden’s Re-election Effort

A new $120 million pledge to lift President Biden and his allies will push the total expected spending from outside groups working to re-elect Mr. Biden to $1 billion this year.

The League of Conservation Voters, a leading climate organization that is among the biggest spenders on progressive causes, announced its plans for backing Mr. Biden on Tuesday, at a moment when his Republican challenger, former President Donald J. Trump, is struggling to raise funds. Mr. Biden’s campaign, independent of the outside groups, expects to raise and spend $2 billion as part of his re-election bid.

Republican groups are likely to spend big ahead of November, as well, but it is difficult to make direct comparisons between the Democratic organizations and their Republican counterparts. Democratic and progressive organizations often announce their spending plans before they have raised the funds, which often come in from small donors. Republican groups that rely more on major donors tend not to telegraph their plans.

The pro-Biden outside money originates from nearly a dozen organizations that include climate groups, labor unions and traditional super PACs. There are left-wing groups like MoveOn and moderate Republicans like Republican Voters Against Trump.

The largest spenders so far are Future Forward, the super PAC blessed by the Biden campaign, which has reserved more than $250 million in television advertising; the Service Employees International Union, which said last week that it would spend $200 million to back Mr. Biden and fellow Democrats; and American Bridge, the Democratic research organization that said in January that it planned to spend $140 million on an anti-Trump advertising campaign in battleground states.

“The sheer scale of what we’re talking about has never been seen before in our country’s history,” said Tiffany Muller, the president of End Citizens United, the government reform advocacy group working to limit the ability of these types of outside groups to spend unlimited sums on elections.