Mexico ruling party majority hangs in balance after close vote

By Dave Graham and David Alire Garcia MEXICO CITY (Reuters) - Mexican President Enrique Pena Nieto's slim working majority in the lower house of Congress sat in the balance early on Monday after mid-term elections held amid widespread anger over corruption, gang violence and weak economic growth. Mexicans cast votes on Sunday for the 500-strong lower house as well as nine state governorships and more than 1,000 state and municipal posts in what was seen as a referendum on Pena Nieto´s rule