Unions had high hopes for the election, spending $188 million backing Democratic candidates and voting for Biden in larger numbers than the general electorate did. They were also a major source of grassroots organizing power for the party.

Yet Democrats failed to win in many Senate battlegrounds this week, and both parties are still short of a majority in the chamber. Georgia is now the key to control of the Senate, with both of the state’s races appearing likely to head to runoffs in early January.

Despite the disappointing results, Weingarten and other union leaders say they’re not giving up. She says there will be “a real fight” to enact Democrats’ PRO Act in a GOP-controlled Senate, a bill that Biden has backed as a major priority of his administration that would vastly expand workers’ ability to form unions.

But passing that legislation and raising the federal minimum wage to $15 may be unachievable with GOP control of the Senate. House Democrats’ faced major headwinds from red-state members of their own caucus when pushing for the Raise the Wage Act, which the chamber passed July 18.

Enacting the most progressive reforms largely hinged “on taking over the Senate and either winning enough votes to make the filibuster unimportant or dealing with the filibuster,” Rep. Andy Levin (D-Mich.), who serves on the Health Education and Labor Committee, said.

A Biden administration could still get a lot done if it “puts the right people” in the Labor Department, Levin said, “but there’s no fundamental reform.”

Biden will also have to weigh how much political capital he wants to risk with the powerful business lobby — which has billed the Democrats’ proposals as potential job killers and warned that putting any more liability on businesses could stymie the economic recovery from the coronavirus.

Some in the business community pointed to 2009, when newly elected President Barack Obama fell silent on a key labor-backed bill, the Employee Free Choice Act, despite endorsing it in the 2008 campaign and calling it a top priority.

Even with a 60-vote Democratic Senate supermajority, the party couldn’t pass the bill, which would have allowed unions to represent workers based on the informal collection of signed authorization forms, known as card check, instead of an NLRB-supervised secret ballot election.

The labor movement will keep pushing for its agenda, despite the shaky odds of full Democratic control of Congress, said AFL-CIO President Richard Trumka.

“We'll figure out a way to get it done eventually,” Trumka said on a press call Thursday. “And we’ll have popular support. There are a number of legislative vehicles that we use; we will try everything we can.”

Weingarten said she is optimistic about Biden’s chances to find some bipartisanship in a divided Washington. “Given who Joe Biden is,” she said, “he uniquely will help demonstrate to these hard-core Republican senators and to the business community that long-term it's in everyone's interest to rebuild the middle class.“

Other labor leaders agreed that they don’t plan to tamp down their expectations of Biden’s labor agenda even if Republicans win control of the Senate, a result that won’t be known until January with the likely Georgia runoff elections.

“We are going to stay fiercely committed to demanding that the House, Senate and president take dramatic, bold action on curbing the pandemic and creating good jobs that people can feed their families on, and by tackling racial and inequality and the climate crisis,” Mary Kay Henry, international president of the 2 million-member Service Employees International Union, told POLITICO.

Major unions like SEIU organized canvassing drives and texting campaigns in swing states such as Michigan, Wisconsin and Nevada. Union members overall were more likely to support Biden than voters generally, with 57 percent of union households backing him compared to 51 percent of non-union households, according to The New York Times’ exit polling.

But labor leaders say President Donald Trump aided the GOP’s performance by giving working people a message — albeit a false one — that they wanted to hear: Covid-19 will end after Election Day.

“If you're tired of COVID, and you're fatigued by COVID, and you're anxious to get back to your job and your work or your small business is teetering, you want to believe that,” Weingarten said.

“You can't underestimate the social isolation that has happened in America, since the start of this terrible pandemic,” she said.

Other leaders blamed Democrats’ performance in congressional races on freshman lawmakers, who are usually the most vulnerable in their efforts to get reelected.

“Democrats can also always do a better job of talking about kitchen table economics,” said Trumka. “I tell them that every single time that I meet with them, but many of the losses that we saw on the House side, were in districts with first-time Democratic seats.”

Former Labor Secretary Robert Reich said a Biden presidency could be the last chance for unions to secure an expansion of labor rights before restrictions on collective bargaining drown out their influence.

“As organized labor declines in numbers and percentage of the workforce, it has less political clout,” said Reich, who served under President Bill Clinton. “So it’s a death spiral."