Six House Republicans who are running for Senate this year in competitive states voted for the House GOP's 2015 budget -- and Democrats wasted no time in making it a top campaign issue. 

Reps. Bill Cassidy (La.), Shelley Moore CapitoShelley Wellons Moore CapitoRepublicans struggle to save funding for Trump's border wall White House looks to rein in gas prices ahead of busy travel season Bipartisan success in the Senate signals room for more compromise MORE (W.Va.), Tom CottonTom Bryant CottonCotton swipes at Fauci: 'These bureaucrats think that they are the science' Graham emerges as go-to ally for Biden's judicial picks China draws scrutiny over case of tennis star Peng Shuai MORE (Ark.), Steve Daines (Mont.), Cory GardnerCory GardnerGun control group alleges campaign finance violations in lawsuit against NRA Colorado Supreme Court signs off on new congressional map Colorado remap plan creates new competitive district MORE (Colo.) and James Lankford (Okla.) all supported Rep. Paul RyanPaul Davis RyanNo time for the timid: The dual threats of progressives and Trump Juan Williams: Pelosi shows her power Cheney takes shot at Trump: 'I like Republican presidents who win re-election' MORE's (R-Wis.) budget. 

Previewing campaign advertisements to come, the Democratic Senatorial Campaign Committee said GOP Senate candidates "overwhelmingly" voted for the GOP budget that would cut spending by $5.1 trillion over the next decade with overhauls of social programs.

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"Republican Senate candidates are sending a message loud and clear to women of their states that if elected to the Senate, they will put special interests like Koch brothers first, not women and middle class families," said DSCC spokeswoman Regan Page.  

Sen. Mark PryorMark Lunsford PryorBottom line Everybody wants Joe Manchin Cotton glides to reelection in Arkansas MORE's (D-Ark.) campaign, a top GOP target, criticized the proposal in the budget to create an optional private system for future seniors.

"Congressman Cotton just isn't listening to Arkansas seniors, and that's why he continues to vote for these irresponsible plans to end Medicare as we know it," said Erik Dorey, a Pryor campaign spokesman.

In a statement, Cotton said the GOP budget "preserves Medicare for future generations."

"I urge my colleagues in the Senate to stop sitting idly by and waiting for our country to descend into financial ruin," Cotton said.

Newly-appointed Sen. John Walsh (D-Mont.) hit his opponent with "10 Ways the Daines Budget hurts Montanans." 

“With a single vote, Congressman Daines has put thousands of Montana seniors, children, veterans and families at risk while protecting his fellow millionaires and big corporations,” said Walsh spokeswoman Lauren Passalacqua. “Montanans deserve an explanation from their congressman about his choice to protect his friends at the expense of the people he is supposed to serve.”

But in the Georgia primary, GOP members didn't think Ryan's proposal went far enough. The three House Republicans -- Reps. Paul BrounPaul Collins BrounHundreds apply to fill Isakson's Senate seat in Georgia Joe Lieberman's son running for Senate in Georgia California lawmaker's chief of staff resigns after indictment MORE, Phil GingreyJohn (Phil) Phillip GingreyEx-Tea Party lawmakers turn heads on K Street 2017's top health care stories, from ObamaCare to opioids Beating the drum on healthcare MORE and Jack Kingston -- who are running for Senate all voted against the budget. The three also voted against the December budget deal negotiated by House Budget Committee Chairman Paul Ryan (R-Wis.) and his Senate counterpart, Patty MurrayPatricia (Patty) Lynn MurrayBiden signs four bills aimed at helping veterans On The Money — Biden sticks with Powell despite pressure Senators call for Smithsonian Latino, women's museums to be built on National Mall MORE (D-Wash.).