Elvis Presley was a virtual unknown when, in 1956, he strutted his stuff in front of a national television audience for the very first time. By year's end, following a dozen TV appearances, he was an international superstar. Over the next two decades, Elvis turned to TV whenever his career required a boost or a complete makeover. "Channeling Elvis: How Television Saved the King of Rock 'n' Roll" peers through TV's unique lens to take a close-up look...