Leno holds lead

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NBC's "The Tonight Show with Jay Leno," back in its Los Angeles home base after a week in Chicago, is averaging a 5.4 household Nielsen rating in the metered markets, with a 15 share. CBS' "The Late Show with David Letterman," in San Francisco for the week, is averaging a 5.3 rating with a 33 share. When ratings from the entire country come in, Letterman may yet gain the upper hand.

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