WASHINGTON - MARCH 14:  U.S. Sen. Barack Obama (D-IL) speaks to members of International Association of Fire Fighters (IAFF) during a bipartisan presidential forum March 14, 2007 in Washington, DC. Also participating in the forum were Democrats Hillary Rodham Clinton and  John Edwards and Republican John McCain. Former New York City Mayor Rudolph Giuliani, a Republican, declined to attend citing scheduling conflicts. Getty Images logo Getty Images 63 months ago

WASHINGTON - MARCH 14: U.S. Sen. Barack Obama (D-IL) speaks to members of International Association of Fire Fighters (IAFF) during a bipartisan presidential forum March 14, 2007 in Washington, DC. Also participating in the forum were Democrats Hillary Rodham Clinton and John Edwards and Republican John McCain. Former New York City Mayor Rudolph Giuliani, a Republican, declined to attend citing scheduling conflicts.