A behind-the-scenes video of Katie Couric's interview with Sen. John McCain and his mother, Roberta McCain, is up on Couric's YouTube page. After meeting Roberta, who is 96-years-old, Couric says, "I'd like to look like her when I'm fifty-six!" Later, Couric and the presidential nominee talk about his recent Daily Show appearance. The full interview airs tonight on the CBS Evening News: