Even on weeknights, the White House is a party house. The Obamas hosted a star-studded poetry jam Tuesday night that President Obama said was meant to “celebrate the power of words.” Michelle, meanwhile, told guests to “enjoy, have fun, and be loose.” Several writers of various backgrounds performed, including James Earl Jones and Mayda del Valle. Director Spike Lee, ABC News anchor George Stephanopoulos, and even veep Joe Biden were spotted in the crowd, enjoying music from bassist Eric Lewis and singer Esperanza Spalding. “Our goal really is to bring the house alive,’’ White House social secretary Desiree Rogers said. Since Inauguration Day, the Obamas have hosted Sheryl Crow, Stevie Wonder, Fergie from the Black Eyed Peas, and Paul Muldoon, a Pulitzer Prize-winning poet from Ireland.