The leaders of the conservative National Action Party and the leftist Democratic Revolution Party joined Pena Nieto in signing the "Pact for Mexico" on Sunday. It includes measures Pena Nieto announced during his inauguration, including education reform, pensions for people 65 and older, and concessions for two new national television stations.
Pena Nieto's Institutional Revolutionary Party ruled Mexico for 71 years before being voted out 12 years ago.
His inauguration Saturday was marred by at-times violent protests.
Mexico City Mayor Marcelo Ebrard says eight people were injured, including one gravely, and 92 detained. He blamed anarchist groups for vandalism, attacks on businesses and other "barbaric acts."
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