Up in the clouds on the presidential airplane, Vicente Fox summoned the deep, defiant tone of voice that helped bring down seven decades of autocracy to talk about his government’s fight against a wave of drug-related violence that has badly shaken the nation’s faith in its young democracy.Mexican federal agents guard the Americas bridge in Nuevo Laredo on the drug-infested United States border. Attorney General Daniel Cabeza de Vaca of Mexico, right, with the attorney general of the United States, Alberto R. Gonzales.”We are going to win the battle against insecurity,” he said, pounding his fist on a table. “It is a frontal war. It is a permanent fight. It is going to take time, but we are going to win.” Full Story