MEXICO CITY (Reuters) - The leftist who a year ago was a hair's breadth from winning Mexico's presidency was reduced to political artifact on Sunday, drawing a fraction of his old crowds to an anniversary rally. Andres Manuel Lopez Obrador, who insists his razor-thin defeat to Felipe Calderon in the July 2, 2006, election was rigged, has spent most of the past year crisscrossing Mexico to declare himself the "legitimate president." While Sunday's rally attracted tens of thousands of people, numbers were far fewer than the estimated 300,000 who turned out for Lopez Obrador in the run-up to the election...