ADVANCE FOR SATURDAY, AUG. 30, AND THEREAFTER - FILE - This Aug. 5, 2014, file photo shows Sen. Rand Paul, R-Ky., as he is introduced to speak during a meeting with local Republicans in Hiawatha, Iowa. One set of elections ends in early November as another begins when presidential hopefuls cross the unofficial starting line in the 2016 race for the White House. With control of the Senate at stake, the months leading up to the mid-term elections offer a clearer window on a crowd of potential presidential candidates already jockeying for position from Nevada to New Hampshire. (AP Photo/Charlie Neibergall, File)
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