U.S. President Barack Obama applauds as singer Shakira takes the stage to sing the Colombian national anthem at the arrival ceremony for the Summit of the Americas in Cartagena April 14, 2012. President Obama’s challenge as he rubs shoulders this weekend with CEOs and political leaders from the Americas is convincing U.S. business that he’s serious about expanding trade in the Americas and persuading Latin American leaders to once again look northward. REUTERS/Kevin Lamarque (COLOMBIA - Tags: POLITICS BUSINESS ENTERTAINMENT TPX IMAGES OF THE DAY)
