U.S. President Obama, Mexico's President Calderon, and Canada's Prime Minister Harper pose for photographs in Guadalajara, Mexico

U.S. President Obama, Mexico
U.S. President Barack Obama (R), is joined by Mexico's President Felipe Calderon (C), and Canada's Prime Minister Stephen Harper as they pose for photographs before participating in a leader's trilateral meeting at the Cabanas Cultural Center in Guadalajara, while attending the North American Leader's Summit, August 10, 2009. Obama, Calderon, and Harper gather on Monday to present a united front to try to limit the spread of the H1N1 swine flu, but there is less unity on simmering trade issues. REUTERS/Larry Downing (MEXICO POLITICS)