What its first leftist leader might mean for Colombia.

It struck a chord with voters frustrated by deep-set inequality in the country, but Petro faces many hurdles; his coalition remains a minority in a Congress still dominated by conservative lawmakers. Petro has pledged to prosecute security forces accused of human- rights violations - many of whom received training from the U.S. Army - restructure trade relations with the U.S., and abandon the "ineffective" war on drugs. FORMER GUERRILLA REBEL GUSTAVO Petro made history on June 19 when he was elected Colombia's first- ever leftist President - achieving a narrow victory over populist outsider Rodolfo Hernandez, with 50.4% of the vote. [Extracted from the article]