MEXICO CITY — Soldiers captured one of Mexico's most-wanted drug smugglers, whose nickname "la burra" _ female donkey _ belies his power as the alleged trafficker controlling drugs flowing through the northern city of Monterrey. Authorities announced the arrest of Hector Huerta Rios on Wednesday, just hours before U.S. Secretary of State Hillary Clinton arrives for a two-day visit to discuss security issues and U.S.