Mexico old guard has new face in return to power

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President-elect of Mexico Enrique Pena Nieto visits Rideau Hall in Ottawa on Wednesday Nov. 28, 2012. (AP Photo/The Canadian Press, Sean Kilpatrick)The party that ruled Mexico for seven decades returns to power Saturday with a president from a new generation to govern a country that has changed dramatically in the 12 years since the Institutional Revolutionary Party last held the top post.