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Potential 2016 Candidates Paul, Rubio Push Senate Colleagues to Boost Defense Spending
Paul has made a name for himself by pressuring leaders to accept spending cuts.

U.S. Sen. Rand Paul (R-KY) listens to a question after speaking at Beantowne Coffee House & Cafe March 21, 2015 in Hampstead, New Hampshire.
Photo by Darren McCollester/Getty Images