Venezuelan President Hugo Chavez accused Mexican leader Vicente Fox on Sunday of disrespecting him and his close ally the Argentine president, warning Fox: "Don't mess with me." Tensions between Fox and Chavez spilled over after this month's Summit of the Americas in Argentina, where Fox sought to defend a U.S.-backed proposal for a free trade zone while Chavez proclaimed the idea dead. "President Fox left bleeding from his wound," Chavez said during his weekly radio and TV show, echoing remarks days ago in which he accused Fox of being a "puppy" of the U.S. government for supporting its plans for...