This undated handout image provided by the Smithsonian's National Portrait Gallery shows a screenprint of first lady Michelle Obama by Mickalene Thomas. Move over Martha Washington. Martha Stewart is taking her place in the National Portrait Gallery in Washington. The museum's new exhibit, "Americans Now," opened Friday, featuring some famous names from science, business, government, entertainment and the arts. Images of President Barack Obama and first lady Michelle Obama are among the portraits. Photo courtesy AP.