James Cameron’s Avatar could not evade the first family, which went to see the country’s No. 1 film Thursday morning. Barack and Michelle Obama brought their daughters, Sasha and Malia, to a movie theater near their rented Hawaiian vacation home before noon to see the visually stunning 3-D film in a theater all to themselves, according to officials. Before heading the movies, however, the president, a self-described movie buff, worked on getting to be another kind of buff at gym facilities at the nearby Marine Corps base. After the movies and gym session, however, the Obamas plan to return to the White House in 2010, just a few years short of Avatar’s 2154 setting.