First Lady Dazzles In Blue Gown At State Dinner [Pic in URL] Michelle Obama’s dress has one-shoulder silhouette, fully-boned corset President Barack Obama and first lady Michelle Obama walk out to welcome Mexican President Felipe Calderon and his wife Margarita Zavala to the state dinner at the North Portico of the White House. May 19, 2010 Michelle Obama chose a shimmery blue gown for the state dinner Wednesday night honoring Mexican President Felipe Calderon and his wife, Margarita Zavala. It had a one-shoulder silhouette, similar to the one Mrs. Obama wore to her husband's inaugural balls. The dress was by...