Answer: JAYLENO

AnswerCrossword Clue
JAYLENOTV monologist
JAYLENOHe returned to his former job on March 1, 2010
JAYLENODavid Letterman rival, for a long time
JAYLENOHe told 18,802 political jokes in his first decade
JAYLENO"Headlines" presenter
JAYLENOPopular NBC host
JAYLENOHe's on "Tonight" tonight
JAYLENOLate-night TV star
JAYLENOTV talk host
JAYLENO"Headlines" comic
JAYLENOLate-night TV host
JAYLENOTV host since 5-25-92
JAYLENOOne of the subjects of "The Late Shift"
JAYLENODavid Letterman's rival
JAYLENO"Leading With My Chin" author
JAYLENODavid Letterman rival
JAYLENOLantern-jawed host
JAYLENOHost on NBC