Grover Cleveland is the historical standard among American presidents who lose or leave office then seek to regain it. The reason is simple: he achieved his goal. Cleveland, however, is hardly the only commander-in-chief who tried to win back what was lost. The difference is that the historical record for ex-presidents trying for a comeback is pretty terrible. ALSO READ: 16 worthless things Trump will give you for your money Want more breaking political news? Click for the latest headlines at Raw Story. And there are some Democrats who, toward the end of Cleveland’s second term in the late 188…