NBC's "Today" With Guests Marissa Mayer, Martha Stewart

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David Gregory appears on NBC News' 'Today' show -- Nyhetsfoto2010,Alternativ,Bakom kulisserna,Barnsele,Bebis,Besättning,David Gregory - Journalist,Docka,Framträdande,Färgbild,Horisontell,Inomhus,Konstkultur och underhållning,NBC News,Porträtt,Staden New York,TV-program,Talkshow,The Today Show,USAPhotographer Collection: NBCUniversal 2013 NBCUniversal Media, LLC.TODAY -- Pictured: David Gregory appears on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)