Sen. Kelly Ayotte, R-N.H., and Sen. John McCain, R-Ariz., seen here in 2012, are both facing competitive elections in 2016. Charles Krupa/AP hide caption

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How To Lose The Senate In 82 Days

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Bernie Sanders and Ted Cruz celebrate with supporters after winning the Wisconsin primary contests on Tuesday. Brennan Linsley and Paul Sancya/AP hide caption

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Republican Ted Cruz (left) addresses the media after a campaign rally earlier this month in Kansas City, Mo.; Democrat Bernie Sanders speaks at a town hall event last week in Milwaukee. Polls ahead of Tuesday's Wisconsin primary contests gave Cruz and Sanders narrow leads. Kyle Rivas (L) and Darren Hauck (R)/Getty Images hide caption

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Sarah White (right) hugs "Mother" Martha Freeman, known as the change-maker or a violence-interrupter, in the Garden Homes Park neighborhood of Milwaukee, Wis. Michael Sears/Milwaukee Journal Sentinel hide caption

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The Milwaukee Mom Who Isn't Afraid To Step In Front Of Guns

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Marquette University scientist Michael Schläppi grows rice in paddies on his lab's rooftop. Michael Schläppi hide caption

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Rice Finds A Welcome Home In Wisconsin Paddies

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Wisconsin Gov. Scott Walker speaks at the Western Conservative Summit, hosted by the Centennial Institute, Colorado Christian University's think tank, in Denver, last month. Walker is announcing a run for the White House, joining more than a dozen Republicans to enter the 2016 contest. Brennan Linsley/AP hide caption

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This combination made with file photos provided by the Madison, Wis., police department and Wisconsin Department of Corrections shows Madison Police officer Matt Kenny (left) and Tony Robinson, a biracial man who was killed by the officer. Kenny shot the unarmed 19-year-old in an apartment house on March 6. Uncredited/AP hide caption

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Frank Kaminsky of the Wisconsin Badgers will face off against the Duke Blue Devils' Jahlil Okafor in Monday night's NCAA title game. When the teams played in December, Duke won 80-70. Mike McGinnis/Getty Images hide caption

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NCAA Men's Final: Wisconsin And Duke Play For It All Monday Night

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A makeshift memorial is seen on March 11 in Madison, Wis., in remembrance of 19-year-old Tony Robinson, who was fatally shot by a Madison police officer on March 6. Carrie Antlfinger/AP hide caption

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