MEXICO CITY (Reuters) - Mexico’s new president Andres Manuel Lopez Obrador said he would pursue friend and foe alike in a crackdown on corruption after voters handed him a powerful mandate for government with a landslide election victory on Sunday. Lopez Obrador, the first leftist president since the end of one-party rule in 2000, won between 53 and 53.8 percent of votes, according to a quick count by the electoral authority, more than double the total for his nearest rival.