Can Oprah sell a presidential candidate the way she pushes books? The daytime diva will test her political powers of persuasion on Dec. 8 and 9 when she stumps for her candidate of choice, Barack Obama, in early-primary states Iowa and South Carolina (with a stop in New Hampshire at a later date). Oprah already raised about $3 million for Obama's campaign, her first foray into supporting a candidate, in September when she hosted a gala at her Santa Barbara estate. - Ileane Rudolph