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The attack is the DSCC's first in response to the shutdown threat, which has split GOP lawmakers. The Democratic group believes they can use the issue to paint Cotton, who just announced he would challenge Sen. Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.), as outside the mainstream.


Pryor is viewed by strategists in both parties as the most vulnerable Democratic senator up for reelection this cycle, and his seat is a must-win for Republicans if they hope to take back Senate control. Cotton is a favorite of both the Tea Party and establishment Republicans.

"Arkansans need leaders who are standing up for them in Washington, not self-serving politicians like Tom CottonTom CottonOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Lawmakers grapple with warrantless wiretapping program Senate passes 0B defense bill MORE who care more about their personal political ambition instead than fighting for Arkansas," said Barasky.

Cotton's spokeswoman said on Wednesday that the lawmaker "strongly supports all efforts to defund, delay and ultimately repeal Obamacare, regardless the legislative approach."

Cotton told radio host Hugh Hewitt earlier this summer that upcoming fights over the debt ceiling and a spending bill could be critical in blocking the president's healthcare reform bill.

"I think that when we return from our August recess in September with our continuing resolution and then in October-November with the debt ceiling, those are important opportunities to try to strike another blow against ObamaCare before that law takes effect, before the insurance marketplaces begin to open for enrollment on October 1 and before they open for business on January 1," Cotton said.

"And whether that takes the form of trying to defund it or trying to effectively defund it by delaying for a year or two years the core provisions ... because those are two must-pass pieces of legislation it gives us an opportunity to defund ObamaCare before it takes effect."

A number of Senate Republicans have slammed the idea of using the debates to try to defund the healthcare law, which has been pushed by Sen. Mike LeeMichael (Mike) Shumway LeeOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea MORE (R-Utah).

Sen. Richard BurrRichard Mauze BurrLawmakers grapple with warrantless wiretapping program Facebook under fire over Russian ads in election 5 senators call for US to shutter embassy in Havana MORE (R-N.C.) has called it the "dumbest idea" he's ever heard of, while Sen. Bob CorkerRobert (Bob) Phillips CorkerOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Corker pressed as reelection challenges mount MORE (R-Tenn.) has called it a "silly effort."