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FILE - In this undated file photo originally provided by NBC, Sid Caesar, left, and Imogene Coca are shown in a scene from "Your Show of Shows." Caesar, whose sketches lit up 1950s television with zany humor, died Wednesday, Feb. 12, 2014. He was 91. (AP Photo/NBC, File)

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Hillary Rodham Clinton, former secretary of state, was the subject of 173 minutes of coverage on Fox News, CNN and NBC from Feb. 3-9, according to a study released by Mediaite.com. (ASSOCIATED PRESS)

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FILE - This Jan. 12, 2012 file photo shows NBC News special correspondent and former "Today" show host Tom Brokaw, attending the "Today" show 60th anniversary celebration at the Edison Ballroom, in New York. NBC News says the veteran newsman has cancer. The network says Brokaw was diagnosed in August 2013 with multiple myeloma, a cancer affecting blood cells in the bone marrow. (AP Photo/Evan Agostini, file)

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**FILE** - This Jan. 12, 2012 file photo shows NBC News special correspondent and former "Today" show host Tom Brokaw attending the "Today" show 60th anniversary celebration at the Edison Ballroom in New York. (AP Photo/Evan Agostini, file)

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FILE - In this photo provided by NBC Lady Gaga performs during the season five finale of “The Voice” on Tuesday, Dec. 17, 2013, in Los Angeles. NBC announced Monday, Feb. 10, 2014, that Will Smith will appear on the Feb. 17 debut of “The Tonight Show Starring Jimmy Fallon.” U2 will perform. Justin Timberlake will close out the week, which will also include appearances from Michelle Obama, Will Ferrell, Bradley Cooper, Kristen Wiig and Jerry Seinfeld. Lady Gaga, Arcade Fire and Tim McGraw will also perform during the week. (AP Photo/NBC, Trae Patton)

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Image: NBC screenshot

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File-This photo released by NBC shows Jimmy Fallon who will be the new host of "Tonight Show Starring Jimmy Fallon". Fallon’s departure from “Late Night” on Friday, Feb. 7, 2014, after five years in the host chair, he will be off the NBC airwaves a scant 10 days before coming back as host of “The Tonight Show,” which was vacated a day earlier by Jay Leno after 22 years. (AP Photo/NBC, Chris Haston, File)

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This image provided by Chevrolet shows a scene from a one of two of the automaker's ads that feature gay couples and families that will air during the Olympic opening ceremony on NBC on Friday, Feb. 7, 2014. It’s the latest example of advertisers trying to be more inclusive in who they show in their commercials. (AP Photo/Chevrolet)