Examines the public infighting and the behind-the-scenes struggles at the core of Mexico's 2006 presidential election and the subsequent constitutional crisis that arose when the losing leftist candidate, former Mexico City Mayor Andrs Manuel Lpez Obrador, refused in a somewhat quixotic manner to concede defeat to Felipe Caldern, the former Energy Secretary, and actually installed himself as ''the legitimate president of Mexico'' before a overflowing huge crowd of dedicated supporters.