Mexico ruling party claims win in key state, rivals cry foul

Mexico's ruling party narrowly held onto the governorship of the country's largest state Sunday, according to preliminary election results, but a fiery leftist hoping to ride the race to the presidency cried foul.The election in the state of Mexico, President Enrique Pena Nieto's home state, was closely watched as a bellwether ahead of presidential polls next year.It was a must-win race for Pena Nieto and the Institutional Revolutionary Party (PRI), which had to fend off a fierce challenge from