John Walsh

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Sen. John Walsh, Montana Democrat, has been accused of plagiarizing large portions of his master's thesis. (AP Photo/J. Scott Applewhite)

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Panel of journalist from left, John Adams of the Great Falls Tribune, Tim McGonigal of KRTV and moderator Rich Ecke, of the Great Falls Tribune, hold a Democratic campaign forum for U.S. Senate with U.S. Sen. John Walsh, former Lt. Governor John Bohlinger and senate candidate Dirk Adams Saturday, May 3, 2014, in the Cameron Auditorium at Benefits Health System, Great Falls, Mont. (AP Photo/The Great Falls Tribune, Larry Beckner)

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Moderator Rich Ecke, of the Great Falls Tribune, moderates a Democratic campaign forum for U.S. Senate with U.S. Sen. John Walsh, former Lt. Governor John Bohlinger and senate candidate Dirk Adams Saturday, May 3, 2014, in the Cameron Auditorium at Benefits Health System Great Falls, Mont. (AP Photo/The Great Falls Tribune, Larry Beckner)

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Drug Enforcement Administration (DEA) Deputy Administrator Thomas M. Harrigan, left, and U.S. Attorney for the District of Colorado John Walsh, prepare to testify on Capitol Hill in Washington, Tuesday, March 4, 2014, before the House Oversight subcommittee on Government Operations on the Obama Administration’s policies on marijuana. (AP Photo/J. Scott Applewhite)

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Sen. John Walsh, Montana Democrat, cast a vote in favor of raising the debt ceiling in his first full day on the job on Wednesday. (Associated Press)

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Sen. John Walsh, D-Mont., right, and his son Michael leave the Old Senate Chamber on Capitol Hill in Washington, Tuesday, Feb. 11, 2014, after a ceremonial swearing-in ceremony with Vice President Joe Biden. Walsh became the newest member of the U.S. Senate on Tuesday and faces the challenge of making his appointment more permanent. (AP Photo/Lauren Victoria Burke)

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Sen. John Walsh, D-Mont., left, accompanied by his wife Janet, shakes hands with Vice President Joe Biden after a ceremonial swearing-in ceremony to the U.S. Senate, Tuesday, Feb. 11, 2014, on Capitol Hill in Washington. (AP Photo/Lauren Victoria Burke)

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This frame grab image provided by Senate Television shows Vice President Joe Biden administering the Senate oath to Sen. John Walsh, D-Mont., Tuesday, Feb. 11, 2014, in the Senate chamber on Capitol Hill in Washington. Walsh became the newest member of the U.S. Senate on Tuesday and faces the challenge of making his appointment more permanent. (AP Photo/Senate Television)

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Sen. John Walsh, D-Mont., center, accompanied by his wife Janet, second from right, participates in a ceremonial swearing-in ceremony as Vice President Joe Biden reads the oath of office, Tuesday, Feb. 11, 2014, on Capitol Hill in Washington. Walsh daughter-in-law April Walsh holds his granddughter Kennedy at left. (AP Photo/Lauren Victoria Burke)