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 CapitoFamily, friends mourn death of Barbara Bush Lawmakers propose boosting park funding with oil money Lawmakers trade barbs, torch Trump at DC soiree MORE (W.Va.), Tom CottonThomas (Tom) Bryant CottonGOP senator: Democratic opposition to Pompeo 'driven 100 percent by politics' Sunday Shows Preview: Emmanuel Macron talks ahead of state dinner Rand Paul under pressure as Pompeo hunts for votes MORE (Ark.), Steve Daines (Mont.), Cory GardnerCory Scott GardnerPoll: Almost two-thirds of Texas voters support legal recreational marijuana House, Senate GOP compete for cash Overnight Cybersecurity: Senators want info on 'stingray' surveillance in DC | Bills to secure energy infrastructure advance | GOP lawmaker offers cyber deterrence bill MORE (Colo.) and James Lankford (Okla.) all supported Rep. Paul RyanPaul Davis RyanLieu rips Ryan after Waffle House shooting: ‘When will you stop silencing us?’ To succeed in Syria, Democrats should not resist Trump policy House Republicans prepare to battle for leadership slots 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 MurrayThe risk of kicking higher ed reauthorization down the road Trump admin announces abstinence-focused overhaul of teen pregnancy program Overnight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes MORE (D-Wash.).