Democratic presidential hopeful, Sen. Barack Obama D-Ill., center, holds a University of North Dakota autographed hockey stick as he looks toward Sen. Kent Conrad , D.N.D., at the North Dakota Democratic Convention in Grand Forks, N.D., Friday, April 4, 2008. Sen. Byron Dorgan, D-N.D., applauds at right.
PHILADELPHIA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) greets his campaign volunteers after speaking during a training session at the Pennsylvania Convention Center April 2, 2008 in Philadelphia, Pennsylvania. Obama has finished the last leg of his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
PHILADELPHIA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) greets his campaign volunteers after speaking during a training session at the Pennsylvania Convention Center April 2, 2008 in Philadelphia, Pennsylvania. Obama has finished the last leg of his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
PHILADELPHIA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks during a training session for his campaign volunteers at the Pennsylvania Convention Center April 2, 2008 in Philadelphia, Pennsylvania. Obama has finished the last leg of his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
PHILADELPHIA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks during a training session for his campaign volunteers at the Pennsylvania Convention Center April 2, 2008 in Philadelphia, Pennsylvania. Obama has finished the last leg of his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WEST CHESTER, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) (C) chats with a member of the audience during commercial break during a taping of "Hardball College Tour" April 2, 2008 at West Chester College in West Chester, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WEST CHESTER, PA - APRIL 02: Democratic presidential hopeful Sen. Barack Obama (R) of Illinois talks with moderator Chris Matthews (L) during a taping of "Hardball College Tour" April 2, 2008 at West Chester College in West Chester, Pennsylvania. Obama, and rival Sen. Hillary Clinton of New York are locked in tight race the Democratic nomination. Pennyslvania goes to polls.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) poses for photographs with supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) greets supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) greets supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Supporters of Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) laugh as they listen to Obama's speech during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.
WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) speaks to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary.