Jay Leno is poised to end his tenure on NBC's "The Tonight Show" as the most popular host in late-night -- for the second time. "Tonight," which Leno will exit in February, continues to handily beat CBS' "Late Show with David Letterman" and ABC's "Jimmy Kimmel Live!" among all viewers and the 18-to-49 demographic. Leno's prior exit from "Tonight" in 2009 also came with him on top of the ratings.
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