President Barack Obama walks towards Air Force One at Andrews Air Force Base, Md., Wednesday, Sept. 9, 2009, en route to New York, where he will speak at a memorial service for the late CBS News anchorman Walter Cronkite.
ABC News' Diane Sawyer arrives at a memorial service for Walter Cronkite at Avery Fisher Hall at Lincoln Center in New York, Wednesday, Sept. 9, 2009. The CBS News legend died on July 17 at age 92.
CBS Evening News executive producer Rick Kaplan, left, speaks with ABC News' Diane Sawyer, Charles Gibson and Barbara Walters prior to a memorial service for the late CBS anchorman Walter Cronkite in New York, Wednesday, Sept. 9, 2009.
Former CBS Evening News anchor Dan Rather arrives for a memorial service for Walter Cronkite at Avery Fisher Hall at Lincoln Center in New York, Wednesday, Sept. 9, 2009.
ABC News' Bob Woodruff arrives for a memorial service for CBS News anchorman Walter Cronkite at Avery Fisher Hall at Lincoln Center in New York, Wednesday, Sept. 9, 2009.
CBS Evening News anchor Katie Couric, left, greets CBS newsman Bob Schieffer prior to the beginning of a memorial service for late CBS News anchor Walter Cronkite in New York on Wednesday, Sept. 9, 2009.
President Barack Obama and former President Bill Clinton attend a memorial service for the late CBS News anchorman Walter Cronkite at Lincoln Center in New York, Wednesday, Sept. 9, 2009.
"60 Minutes" correspondent Andy Rooney is seen prior to Walter Cronkite's memorial service at Avery Fisher Hall, in New York's Lincoln Center, on Wednesday, Sept. 9, 2009.
"60 Minutes" correspondent Morley Safer is seen prior to Walter Cronkite's memorial service at Avery Fisher Hall, in New York's Lincoln Center, on Wednesday, Sept. 9, 2009.
NBC News' Brian Williams, center, is seen prior to the start of Walter Cronkite's memorial service in New York, Wednesday, Sept. 9, 2009.
Liz Smith is seen prior to the start of Walter Cronkite's memorial service in New York, Wednesday, Sept. 9, 2009.
NBC News' Ann Curry is seen prior to the start of Walter Cronkite's memorial service in New York, Wednesday, Sept. 9, 2009. Cronkite died on July 17 in his Manhattan home at age 92.
Actress Tyne Daly is seen prior to the start of Walter Cronkite's memorial service at Avery Fisher Hall in New York, Wednesday, Sept. 9, 2009.
Former New York City mayor David Dinkins, front right, is seen prior to the start of Walter Cronkite's memorial service at Avery Fisher Hall in New York, Wednesday, Sept. 9, 2009. Cronkite died on July 17 in his Manhattan home at age 92.