Lucy's got some "splainin'" to do...

PIONEERS OF TELEVISION is back with 4 new episodes reminding us of the magic of real laughter on TV...featuring legends such as Phyllis Diller, Joan Rivers and Mary Tyler Moore.
It also looks at Lucille Ball's breakthrough on "I Love Lucy" and covers television's
most enduring variety star, Carol Burnett...PIONEERS OF TELEVISION...7pm

Drawing on FRONTLINE’s rich archive of films and hundreds of interviews, Inside Obama’s Presidency serves as an intimate look at the president’s first term and offers a revealing glimpse into his final four years in office.The film, produced by the award-winning investigative team that delivered The Choice 2012, goes behind closed doors and presents an unflinching view of the sometimes painful political realities of governing in modern-day Washington. FRONTLINE: INSIDE OBAMA'S PRESIDENCY...9pm