Mexican president Enrique Pena Nieto's second anniversary in office has been marred by more protests against his rule. Al Jazeera's Monica Villamizar reports from Mexico City. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/