Lopez Obrador, 64-year-old founder of Morena party, sought to downplay fears of radicalism, after critics branded him a 'tropical Messiah' who would install Venezuela-style policies that could wreck Latin America's second-largest economy. He has vowed to grab the money from Mexico's 'power mafia' and use it for social welfare. IN PIC: Tens of thousands pack Mexico City's main square, the Zocalo. (Photo | AP)