This Feb. 24, 2013 photo released by NBC News shows moderator David Gregory on the set of "Meet the Press," in Washington. Gregory is tweeting that he is leaving NBC. In tweets posted Thursday, Aug. 14, 2014, Gregory said he is leaving the network as he arrived at it, "humbled and grateful." "Meet the Press" has fallen to third place since he took it over in 2008. His departure had been rumored for months. (AP Photo/NBC, William B. Plowman)
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