Sen. John McCain, R-Ariz. answers a question from the audience after formally announcing his candidacy for re-election in 2016 at an Arizona Chamber of Commerce luncheon Tuesday, April 7, 2015, in Phoenix. McCain announced Tuesday that he will run for re-election in 2016, making official a move that has been widely expected for the Republican as he looks to extend his nearly three-decade career in the Senate. (AP Photo/Ross D. Franklin)
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