More than 50,000 people passed by Senator Edward Kennedy’s flag-draped casket over the past two days to pay their respects to the senator. The crowds outside the John F. Kennedy Presidential Library were so long on Thursday night that the senator's family left the building open an extra two hours, until 2 a.m. On Friday, officials had to close the line early so that the library could be prepared for a private family service. Kennedy's widow, Vicki, shook hands with hundreds of visitors, thanking them for coming. Vice President Joe Biden, Sen. John McCain, and several other prominent politicians are scheduled to speak at the private service. All living presidents except George H.W. Bush will attend Kennedy’s Boston funeral on Saturday.