In this Feb. 25, 2010, file photo, President Barack Obama, not pictured, acknowledges actress Sarah Jessica Parker, as first lady Michelle Obama smiles in the East Room of the White House in Washington, before he presented the 2009 National Medal of Arts and National Humanities Medal. It will be Parker's house, but Obama's show. You could call it "Checks and the City." Needing to boost his donor base and campaign cash, Obama is banking on elite entertainers for help so often they have essentially become a cast of characters in his campaign. He is using his Hollywood access and raffling it off as a prize to others, tapping into a nation that revels in celebrity even in hard economic times.