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 CapitoErnst elected to Senate GOP leadership Court rules against Trump administration on gillnet ban rollback The Hill's Morning Report — Presented by PhRMA — Dem path to a Senate majority narrows MORE (W.Va.), Tom CottonThomas (Tom) Bryant CottonSenate barrels toward showdown over Trump's court picks Trump set to have close ally Graham in powerful chairmanship McConnell: Criminal justice bill unlikely this year MORE (Ark.), Steve Daines (Mont.), Cory GardnerCory Scott GardnerMcConnell, Flake clash over protecting Mueller probe Election Countdown: Florida Senate race heads to hand recount | Dem flips Maine House seat | New 2020 trend - the 'friend-raiser' | Ad war intensifies in Mississippi runoff | Blue wave batters California GOP Trump, California battle over climate and cause of fires MORE (Colo.) and James Lankford (Okla.) all supported Rep. Paul RyanPaul Davis RyanCalif. congresswoman-elect bumps into Pelosi at airport How this year’s freshmen can save the Congress — and themselves Democrat Katie Porter unseats GOP's Mimi Walters 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.

"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 PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm 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 BrounCalifornia lawmaker's chief of staff resigns after indictment Republican candidates run against ghost of John Boehner The Trail 2016: Let’s have another debate! MORE, Phil GingreyJohn (Phil) Phillip Gingrey2017's top health care stories, from ObamaCare to opioids Beating the drum on healthcare Former GOP chairman joins K Street 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 MurrayOvernight Health Care — Presented by The Partnership for Safe Medicines — FDA restricts sales of flavored e-cigs | Proposes ban on menthol in tobacco | Left wants vote on single-payer bill in new Congress | More than 12k lost Medicaid in Arkansas Schumer reelected as Senate Democratic Leader Senate GOP readies for leadership reshuffle MORE (D-Wash.).