Rep. Tom CottonTom CottonCotton: I hope we go back to health care next year Sunday shows preview: GOP gears up for Senate tax reform push A simple way to make America even greater is fixing our patent system MORE (R-Ark.) features his drill sergeant in a new ad for his Senate campaign, touting his military record and mocking 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.) for his comments that Cotton had a "sense of entitlement."

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"Sen. Pryor says my military service gives me, quote, 'a sense of entitlement.' So I brought in an expert," Cotton says before his former basic training drill sergeant enters.

"Drill Sergeant Norton taught me to be a soldier: Accountability, humility, and putting the unit before yourself. That training stuck," Cotton says after Norton gives him permission stand "at ease" in the humorous spot.

The light-hearted ad seeks to soften Cotton personally, tout his military record and knock Pryor for comments earlier this spring that Cotton has "a sense of entitlement that he gives off."

"It's almost just like 'I served my country, therefore let me into the Senate.' That's not how it works in Arkansas," Pryor said in an interview to MSNBC last month.

The two are locked in a tight race that could be crucial for the GOP's chances to retake the Senate. Pryor has led in the last few polls, though both parties expect a hard-fought battle through Election Day.