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Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.) on Sunday said the congressional investigation into the deadly attack on the U.S. diplomatic compound in Benghazi, Libya, has “turned into a political exercise.”

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“Benghazi has had more hearings, more documents produced, more investigative effort than the entire Iraq War,” the senator added on ABC’s “This Week.”

McCaskill, who has endorsed former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE’s 2016 presidential campaign, said it’s “pretty clear” that Clinton “implemented all the recommendations of an independent review, she has answered all of the questions.”

“And so I think that they are really getting into dangerous territory where it becomes blatantly obvious that this is just about politics and not about policy,” she added.

McCaskill also said the 2016 race will focus on who will be a “champion for working families in this country.”

“That's what this election is about. It's not about personalities. It's not about what someone looks like or it's not about political gotcha moments. It's about policy,” she said.

“And I think what she's shown this week is she wants to go out one-on-one and make sure she is listening to the American people about their fears and frustrations. I think the way she's going about this campaign shows she's not interested in a coronation either.”

McCaskill said Democrats aren’t challenging Clinton because of her qualifications.

“You have a cast of thousands on the Republican side because there's -- it's clear that many of them are reading Cliff Notes to try to figure out this dangerous world right now,” she added.

McCaskill added that her decision to support President Obama in 2008 was a “tough choice,”

“I am glad I don't have that kind of tough choice this time,” she said. “This is not a hard choice. And I don't think it will be a hard choice for America.”