Conservative donor David Koch in a 2013 file photo. The political network he and his brother, Charles, have created is not backing Donald Trump's presidential bid this year. Phelan M. Ebenhack/AP hide caption

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Phelan M. Ebenhack/AP

Koch Network Building A Senate Wall Against Trump

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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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Charles Krupa/AP

How To Lose The Senate In 82 Days

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Filipino boxing great Manny Pacquiao holds his Certificate of Canvass as he is proclaimed the seventh senator by Commissioner Christopher Lim (right) in a ceremony Thursday. Bullit Marquez/AP hide caption

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Bullit Marquez/AP

Republican Ted Cruz makes a campaign stop at the Bravo Cafe Monday in Osceola, Ind. The Hoosier State might be Cruz's last chance to stop Donald Trump from getting the nomination. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

Senate Majority Leader Mitch McConnell brought a measure up for a vote Thursday that funded the government but defunded Planned Parenthood. Democrats banded together to block it. Evan Vucci/AP hide caption

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Evan Vucci/AP