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Sen. Thad Cochran, R-Miss., listens to testimony by Director of the National Security Agency (NSA), Gen. Keith B. Alexander, Rand Beers, Acting Deputy Secretary of Homeland Security, Patrick Gallagher, director of the Commerce Department's National Institute of Standards and Technology, and Richard McFeely, Executive Assistant Director of Criminal, Cyber, Response and Services Branch, Federal Bureau of Investigation, as they testify about NSA surveillance before the Senate Appropriations Committee on Capitol Hill in Washington, Wednesday, June 12, 2013. (AP Photo/Charles Dharapak)
Sen. Chris McDaniel, R-Ellisville, foreground, explains the rationale for establishing the Mississippi Senate Conservative Coalition, a group dedicated to the advancement of conservative ideas and legislation during a news conference at the Capitol in Jackson, Miss., Tuesday, June 25, 2013. Although the organization is all Republican, McDaniel says they are open to members of other parties. Sen. Michael Watson, R-Pascagoula, in the background, is one of the 11 founding members. (AP Photo/Rogelio V. Solis)
Sen. Thad Cochran, R-Miss., listens to testimony by Director of the National Security Agency (NSA), Gen. Keith B. Alexander, Rand Beers, Acting Deputy Secretary of Homeland Security, Patrick Gallagher, director of the Commerce Department's National Institute of Standards and Technology, and Richard McFeely, Executive Assistant Director of Criminal, Cyber, Response and Services Branch, Federal Bureau of Investigation, as they testify about NSA surveillance before the Senate Appropriations Committee on Capitol Hill in Washington, Wednesday, June 12, 2013. (AP Photo/Charles Dharapak)
Sen. Chris McDaniel, R-Ellisville, foreground, explains the rationale for establishing the Mississippi Senate Conservative Coalition, a group dedicated to the advancement of conservative ideas and legislation during a news conference at the Capitol in Jackson, Miss., Tuesday, June 25, 2013. Although the organization is all Republican, McDaniel says they are open to members of other parties. Sen. Michael Watson, R-Pascagoula, in the background, is one of the 11 founding members. (AP Photo/Rogelio V. Solis)

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Inside Mississippi Senate runoff

Sen. Thad Cochran, a six-term GOP Mississippi senator, battles a tea party challenger Sen. Chris McDaniel.

Inside Mississippi Senate runoff

Sen. Thad Cochran, a six-term GOP Mississippi senator, battles a tea party challenger Sen. Chris McDaniel.