The first eight-plus months of 2013 have convinced us of one thing: Rand Paul acts and the rest of the potential 2016 Republican presidential field reacts. On drones, Paul led a 13-hour-long filibuster that drew Florida Sen. Marco Rubio (among others) to the floor in support. On Syria, Paul was out front in his opposition to a military strike — a position that 30 of his Senate Republican colleagues shared as of this writing. Those 30 include both Rubio,who voted against the use-of-force resolution in the Senate Foreign Relations Committee, and Texas Sen. Ted Cruz. ... Below are our rankings...