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During Congressional testimony Thursday, top executives from Comcast and NBC Universal pledged to restore the luster of the beleaguered Peacock Network, which has suffered through low ratings, a dearth of hit shows, and most recently, the Leno-Conan debacle.

A new network TV show that sees its ratings tumble after its debut usually meets with a swift and unforgiving fate. But don't expect that to be the case for The Jay Leno Show, NBC's prime time experiment with late-night comedy. Thanks to a $10 million promotional campaign, Leno premiered on Sept....