Michelle Obama gave a candid view Saturday of the challenges and emotional toll of being the country’s first black first lady. Obama, speaking to graduates at Tuskegee University in Alabama, described insensitive media questions and derogatory remarks from political pundits that she said have kept her up at night. “You might remember the on-stage celebratory fist bump between me and my husband after a primary win that was referred to as a ‘terrorist fist jab,’ ” she said.