Obama on race in America

Democratic presidential candidate Barack Obama
Democratic presidential candidate Barack Obama speaks in Philadelphia Tuesday, where he spoke about race and politics in America.
EMMANUEL DUNAND/AFP/Getty Images

Democratic presidential hopeful Barack Obama spoke Tuesday in Philadelphia about America's history of racial division, and his hope for a conversation about race that can help unite the country.

NPR senior correspondent Juan Williams joins Midday to discuss what Obama's speech means for the rest of the 2008 presidential campaign.