DENVER - AUGUST 24: CBS news anchor Katie Couric talks during the run up to the Democratic National Convention (DNC) at the Pepsi Center August 24, 2008 in Denver, Colorado. The DNC begins August 25 where U.S. Sen. Barack Obama (D-IL) will be officially nominated as the Democratic nominee for U.S. president.
DENVER - AUGUST 24: Democratic National Committee Chairman Howard Dean (R) is interviewed by CBS news anchor Katie Couric at the site of the Democratic National Convention (DNC) at the Pepsi Center August 24, 2008 in Denver, Colorado. The DNC begins August 25 where U.S. Sen. Barack Obama (D-IL) will be officially nominated as the Democratic nominee for U.S. president.
DENVER - AUGUST 24: Democratic National Committee Chairman Howard Dean (L) is interviewed by CBS news anchor Katie Couric at the site of the Democratic National Convention (DNC) at the Pepsi Center August 24, 2008 in Denver, Colorado. The DNC begins August 25 where U.S. Sen. Barack Obama (D-IL) will be officially nominated as the Democratic nominee for U.S. president.
DENVER - AUGUST 24: Democratic National Committee Chairman Howard Dean (L) is interviewed by CBS news anchor Katie Couric at the site of the Democratic National Convention (DNC) at the Pepsi Center August 24, 2008 in Denver, Colorado. The DNC begins August 25 where U.S. Sen. Barack Obama (D-IL) will be officially nominated as the Democratic nominee for U.S. president.
DENVER - AUGUST 24: Democratic National Committee Chairman Howard Dean (L) is interviewed by CBS news anchor Katie Couric at the site of the Democratic National Convention (DNC) at the Pepsi Center August 24, 2008 in Denver, Colorado. The DNC begins August 25 where U.S. Sen. Barack Obama (D-IL) will be officially nominated as the Democratic nominee for U.S. president.
DENVER - AUGUST 24: CBS news anchor Katie Couric talks during the run up to the Democratic National Convention (DNC) at the Pepsi Center August 24, 2008 in Denver, Colorado. The DNC begins August 25 where U.S. Sen. Barack Obama (D-IL) will be officially nominated as the Democratic nominee for U.S. president.
WASHINGTON - JULY 17: CBS News anchor Katie Couric arrives for the funeral for former White House Press Secretary Tony Snow at the Basillica of the National Shrine of the Immaculate Conception July 17, 2008 in Washington, DC. U.S. President George W. Bush and first lady Laura Bush attended the funeral for Snow, who died Saturday after a long battle with colon cancer.
CBS's Katie Couric (C) shares a moment with her former co-host on NBC's "The Today Show" Al Roker (R) in New York as Couric promotes the "Stand Up to Cancer" telethon in this publicity photo released to Reuters May 28, 2008. It was Couric's first appearance on her old morning talk show since she left NBC for CBS in 2006.
CBS's Katie Couric (L) shares a moment with her former co-host on NBC's "The Today Show" Matt Lauer in New York as Couric promotes the "Stand Up to Cancer" telethon in this publicity photo released to Reuters May 28, 2008. It was Couric's first appearance on her old morning talk show since she left NBC for CBS in 2006.
CBS's Katie Couric (L) shares a moment with her former co-host on NBC's "The Today Show" Matt Lauer in New York as Couric promotes the "Stand Up to Cancer" telethon in this publicity photo released to Reuters May 28, 2008. It was Couric's first appearance on her old morning talk show since she left NBC for CBS in 2006.