Nina Totenberg; John Updike; Twyla Tharp; William Wegman

NPR and ABC contributor Nina Totenberg focuses on the Supreme Court's upcoming cases, including one involving campaign finance. Author John Updike shares his 18th novel, "Toward the End of Time," which looks into the future to examine the way we age. Dancer and choreographer Twyla Tharp shares her many current projects; talks about surgery and her dance company's world tour. Photographer and artist William Wegman and his dog Chip join Charlie in the studio to talk about the wild popularity of his series of photographs featuring Weimaraners.