BOGOTA, March 13 (Reuters) – Gustavo Petro, the front-runner for Colombia’s May presidential election, secured the nomination of the left-wing Historic Pact coalition on Sunday during voting in primaries. Centrist Sergio Fajardo and right-winger Federico Gutierrez, both former mayors of Colombia’s second city Medellin, also secured nominations from their respective coalitions. Petro, a former guerrilla in the[Read More…]