First lady Michelle Obama (in Peter Soronen) walks with her husband U.S President Barack Obama to greet Mexican President Felipe Calderon and his wife Margarita Zavala for a State Dinner at the White House on May 19, 2010 in Washington, DC. President Obama welcomed President Calderon to the White House today for an official state visit that is taking place amid tension over immigration politics and Mexico's deadly drug war. (Photo by Mark Wilson/Getty Images)