Sun Jul 27, 1:11 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., left, speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Jae C. Hong)
Sun Jul 27, 1:11 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., walks by a painting depicting an American Indian after participating in a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008. (AP Photo/Jae C. Hong)
Sun Jul 27, 1:15 PM ET
An images of Democratic presidential candidate, Sen. Barack Obama, D-Ill., is projected on a screen as he speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.
(AP Photo/Jae C. Hong)
Sun Jul 27, 1:16 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., bottom center, participates in a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Jae C. Hong)
Sun Jul 27, 1:25 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., smiles while speaking at a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Jae C. Hong)
Sun Jul 27, 1:35 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., left, speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008, with CNN anchor Suzanne Malvealux and Romesh Ratnesar with Time Magazine.(AP Photo/Jae C. Hong)
Sun Jul 27, 1:37 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., left, speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008, with CNN anchor Suzanne Malvealux and Romesh Ratnesar with Time Magazine.(AP Photo/Jae C. Hong)
Sun Jul 27, 1:41 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Jae C. Hong)
Sun Jul 27, 1:56 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., appears at a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Nam Y. Huh)
Sun Jul 27, 2:07 PM ET
US Democratic presidential candidate Illinois Senator Barack Obama speaks at the UNITY: Journalists of Color conference at McCormick Place convention center in Chicago. Obama said Sunday that he will pick a vice presidential running mate who will "help me govern" and not just somebody "who I send off to go to funerals."(AFP/Getty Images/Scott Olson)
Sun Jul 27, 2:09 PM ET
US Democratic presidential candidate Illinois Senator Barack Obama speaks to attendees at the UNITY: Journalists of Color conference at McCormick Place convention center in Chicago. Obama's foreign tour cemented his status as an international political superstar Sunday, but raised the question of whether rampant adulation abroad will translate into votes in America.(AFP/Getty Images/Scott Olson)
Sun Jul 27, 2:10 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Nam Y. Huh)
Sun Jul 27, 2:11 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Nam Y. Huh)
Sun Jul 27, 2:12 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Nam Y. Huh)
Sun Jul 27, 2:13 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008.(AP Photo/Nam Y. Huh)
Sun Jul 27, 2:30 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008. (AP Photo/Nam Y. Huh)
Sun Jul 27, 2:34 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008. (AP Photo/Nam Y. Huh)
Sun Jul 27, 2:34 PM ET
Democratic presidential candidate, Sen. Barack Obama, D-Ill., left, speaks during a forum at the UNITY '08 Convention in Chicago, Sunday, July 27, 2008, with CNN anchor Suzanne Malvealux and Romesh Ratnesar with Time Magazine.(AP Photo/Nam Y. Huh)
Sun Jul 27, 3:38 PM ET
US Democratic presidential candidate Illinois Senator Barack Obama speaks to attendees at the UNITY: Journalists of Color conference at McCormick Place convention center in Chicago. The event was Obama's first since returning from a week-long overseas trip.(AFP/Getty Images/Scott Olson)