Democrats are increasingly worried that Republicans' overwhelming financial advantage among party committees and outside groups could undercut hopes of a strong midterm showing, even as Democratic candidates continue to outraise many of their GOP opponents in key races, Politico reported Wednesday.

Federal Election Commission filings through the end of June show the three main GOP committees and their affiliated congressional super PACs held a combined $657 million in cash on hand, nearly double the $334 million reported by their Democrat counterparts.

The Republican edge grows even larger when President Donald Trump's MAGA Inc. super PAC is included. The group reported more than $400 million in cash on hand several weeks ago, giving Republicans a combined financial reserve more than three times the amount available to Democratic Party committees and congressional super PACs.

Democrat strategists acknowledge the disparity could allow Republicans to dominate advertising and voter outreach in the closing months before the election.

"What is putting the House majority and the Senate majority, nationally, in danger is the Republicans' massive stockpile of resources that they're putting together to push back," Democrat strategist Morgan Jackson, an adviser to former North Carolina Gov. Roy Cooper's Senate campaign, said.

"If you get outspent five to six to eight to one, that can alleviate the environmental advantage that Democrats have this cycle," Jackson added.

The Republican National Committee alone reported $128 million in cash compared with just $16 million for the Democratic National Committee, which also reported $18 million in debt.

Republican congressional campaign committees also hold fundraising advantages.

The National Republican Senatorial Committee reported $55.9 million in cash on hand versus $41 million for the Democratic Senatorial Campaign Committee, while the National Republican Congressional Committee held $92.7 million compared with $79 million for the Democratic Congressional Campaign Committee.

The GOP's outside spending edge extends to super PACs. Senate Leadership Fund, the leading Republican Senate super PAC, reported roughly $112 million more cash than the Democratic-aligned Senate Majority PAC. Congressional Leadership Fund, the top Republican House super PAC, held approximately $51 million more than House Majority PAC.

Republicans' financial position was further strengthened by a recent Supreme Court ruling easing restrictions on coordination between candidates and political parties, allowing party committees to work more closely with campaigns and potentially stretch their dollars further, Politico reported.

Despite the national fundraising gap, Democrats continue to outperform Republicans at the candidate level.

Georgia Democrat Sen. Jon Ossoff  holds roughly $40 million more cash on hand than Republican Rep. Mike Collins in the Senate race. In Texas, Democrat James Talarico has nearly $20 million more on hand than Republican Attorney General Ken Paxton, while Cooper has about $17 million more than former Republican National Committee Chairman Michael Whatley in North Carolina's Senate contest.

Democrat leaders leaders argue those candidate-level advantages will prove more important than outside spending.

"Republicans can crow all they want about getting massive checks from donors and businesses and billionaires, but we're going to win because we have the actual support from people who are voting," Senate Majority PAC spokeswoman Lauren French said.

Still, Democrat strategists warn that the proliferation of streaming platforms, social media, and other digital outlets has made political advertising more expensive, increasing the importance of well-funded outside groups.

"Too many people think that fragmentation of media meant more efficiency and spending less. Wrong — it means you have to spend more," Democrat strategist Jesse Ferguson said.

Some Democrats also worry that Trump's $400 million MAGA Inc. war chest has yet to be fully spent. Trump political director James Blair said last month Republican spending would begin "very soon," though he did not specify a timetable.

That prospect has heightened Democrat concerns that Republicans could flood competitive races with outside spending in the campaign's final weeks.