Elections test Mexican president as graft, gang murders bite

By Dave Graham and Max De Haldevang MEXICO CITY (Reuters) - Mexican President Enrique Pena Nieto's party is expected to keep its slim working majority in the lower house of Congress in legislative elections on Sunday despite discontent about corruption, gang violence and lackluster economic growth. At least seven candidates and nine campaign officials were murdered in campaigning soured by drug cartel intimidation and dissident teachers protesting against education reforms. After pushing through