— President Barack Obama meets this weekend with leaders of Mexico and Canada at a time when drug-related violence, swine flu and the economic crisis are slipping across North America's borders like never before. Obama, along with Mexican President Felipe Calderon and Canadian Prime Minister Stephen Harper, are expected to work on trade and immigration, drug trafficking and security, and clean energy during their first summit Sunday and Monday in ....Guadalajara. "The bottom line is that what affects our bordering neighbors has the potential to affect us all, so we want to be certain that we have the tightest and...