Why John McCain saw himself as 'The Luckiest Man'

More than two years have passed since the death of Arizona Sen. John McCain, but his legacy and influence are being felt during this election year. McCain’s widow, Cindy, recently endorsed Joe Biden for president. Mark Salter was a longtime aide and confidant of Sen. McCain, whose life he examines in Salter’s new book, “The Luckiest Man.” Salter joins Judy Woodruff to discuss.