BRIDGEPORT, Conn. — The nation’s political center cuts directly between super-wealthy Greenwich and high-achieving Chappaqua, N.Y. Separated by just 13 miles, these sought-after suburbs lay claim to the two most powerful political families of the 21st century: the Bushes and the Clintons. The communities are poised for a rivalry of the highest magnitude, with Greenwich serving as a kind of political piggy bank for one 2016 White House hopeful and Chappaqua as home base for the other early favorite. The competition transcends 203 vs.