Unlike the gay talk show host Rosie O’Donnell before her, Ellen DeGeneres doesn’t publish a magazine of her own. Which means she’s got to rely on the graciousness of editors to land her face on the newsstand. (Cover Girl ads don’t count.) There’s another strategy, however. She could plead with the most powerful woman in media, Oprah Winfrey. Part gag, part legitimate attempt at publicity, Ellen phoned Oprah with a simple request: Now that Oprah is letting other folks on the cover of her magazine O, The Oprah Magazine (read: Michelle Obama), Ellen would like her shot at co-starring with Big O. On yesterday’s show, her wish was granted. Jeez, an entire thesis could be written on how powerful women both compete with and prop up each other.