Mexico ruling party expected to keep slim Congress majority as voting closes

By Dave Graham and Max De Haldevang MEXICO CITY (Reuters) - Mexican President Enrique Pena Nieto's party is expected to retain its slim working majority in the lower house of Congress in mid-term elections on Sunday despite discontent about corruption, gang violence and lackluster economic growth. "The PRI have spent 70 years being corrupt and that is enough," he added, referring to Pena Nieto's ruling centrist Institutional Revolutionary Party (PRI).