MEXICO CITY -- Mexico's Congress was swayed Tuesday by a 7-year-old boy on a mission to save his mom. Second-grader Saul Arellano, a U.S. citizen, appeared in Mexico's 500-member Chamber of Deputies to plead for help in lobbying Washington to stop the deportation of his mother, an illegal immigrant who has taken refuge in a Chicago church. His efforts paid off with a resolution calling on the Bush administration to suspend the deportation of Elvira Arellano and any other illegal immigrant parents of U.S. citizens. If the U.S. agrees, it would "create a precedent that will benefit more than 4.9...