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DENVER - AUGUST 28: Former U.S. Vice President Al Gore wave on stage 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: Former U.S. Vice President Al Gore 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: Former U.S. Vice President Al Gore waves on stage 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: Former U.S. Vice President Al Gore walks off stage 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: Former U.S. Vice President Al Gore waves on stage 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: Former U.S. Vice President Al Gore reacts to the crowd 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: Former U.S. Vice President Al Gore 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: Former U.S. Vice President Al Gore is shown speaking on a large stadium screen 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: Former U.S. Vice President Al Gore 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: Former U.S. Vice President Al Gore waves 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: Former U.S. Vice President Al Gore 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: Former U.S. Vice President Al Gore 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: Former U.S. Vice President Al Gore reacts to the crowd 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: Former U.S. Vice President Al Gore waves 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: Former U.S. Vice President Al Gore points up 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: Former U.S. Vice President Al Gore waves to the audience after his speech during the final day of the Democratic National Convention 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: Former U.S. Vice President Al Gore waves to the audience after his speech during the final day of the Democratic National Convention 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: Former U.S. Vice President Al Gore waves to the audience before his speech during the final day of the Democratic National Convention 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: Former U.S. Vice President Al Gore stands on stage 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: Former U.S. Vice President Al Gore points to the audience before his speech during the final day of the Democratic National Convention 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: Olympic gymnast Shawn Johnson and former Vice President Al Gore participate in a walk-through 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.