The leading super PAC supporting House Democrats in next year’s midterm elections announced on Monday the creation of a $50 million fund to better appeal to working-class voters, calling the task a critical part of any path to take the majority in 2026.

“We’re laying a marker down now,” Mike Smith, the president of the group, the House Majority PAC, said in an interview. “This is a priority.”

The group is calling the new investment its “Win Them Back Fund,” and it comes two years after the super PAC began the 2024 election cycle with specific funds for House seats in New York and California.

But Mr. Smith described the 2026 fund as fundamentally different. It is not focused on a specific geographic cluster of competitive seats but rather on appealing to a demographic cohort of working-class voters — white, Black, Hispanic and Asian — who all across the country drifted away from the party in 2024.

“Crafting and developing a credible working-class message — an economic-framed message — is the single best thing we can do as a party,” Mr. Smith said.

The Win Them Back Fund will begin by spending extensively on research before eventually mounting advertising campaigns in key districts, as well as potentially investing in influencers to spread the party’s message to less engaged voters.