DENVER - AUGUST 28: (L to R) Michelle Obama, wife of Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL), Jill Biden Democratic U.S. Vice-Presidential nominee Joe Biden (D-DE) aand his daughter Ashley watch as Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) speaks day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: (R to L) Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL), Michelle Obama. Jill Biden, Democratic U.S. Vice-Presidential nominee Joe Biden (D-DE), walk on stage on stage on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: (L to R) Michelle Obama. Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL), Jill Biden, Democratic U.S. Vice-Presidential nominee Joe Biden (D-DE), walk on stage stand on stage on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) holds his wife Michelle Obama after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) speaks with running mate U.S. Sen. Joe Biden (D-DE), while Michelle Obama and Jill Biden hug after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. Obama is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) walks with his daughter Sasha and wife Michelle Obama after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. Obama is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) hugs wife Michelle Obama while running mate U.S. Sen. Joe Biden (D-DE), and his wide Jill Biden wave after Obama's speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. Obama is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) hugs his wife Michelle Obama after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) hugs his wife Michelle Obama after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) hugs his wife Michelle Obama after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) hugs his wife Michelle Obama after his speech on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) speaks on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. Obama is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) speaks on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. Obama is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) speaks on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Convention goers celebrate at the conclusion of on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Michelle Obama, Democratic U.S. Vice-Presidential nominee Joe Biden (D-DE), Jill Biden and Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) stand on stage as confetti rains down on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Michelle Obama, Malia Obama, Sasha Obama and Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) wait for Jill Biden and Democratic U.S. Vice-Presidential nominee Joe Biden (D-DE) to walk to them on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: (L to R) Michelle Obama, Malia Obama, Sasha Obama and Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) stand on stage on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: (L to R) Michelle Obama, Malia Obama, Sasha Obama and Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) stand on stage on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.
DENVER - AUGUST 28: Fireworks explode at the conclusion of day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party.