Democratic presidential hopeful, Sen. Barack Obama, D-Ill., right, shakes hands with employees as he arrives to speak at Vernier Software & Technology in Beaverton, Ore., Friday, May 9, 2008.
(AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., bottom center, speaks during a conversation with employees at Vernier Software & Technology in Beaverton, Ore., Friday, May 9, 2008.
(AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., right, shakes hands with supporters in Beaverton, Ore., Friday, May 9, 2008. (AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., leads a discussion on the economy at Vernier Software & Technology in Beaverton, Oregon Friday, May 9, 2008. (AP Photo/Steve Slocum)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks during a conversation with employees at Vernier Software & Technology in Beaverton, Ore., Friday, May 9, 2008. (AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., watches as he is introduced by Verle Walters, foreground, during a conversation with employees at Vernier Software & Technology in Beaverton, Ore., Friday, May 9, 2008. (AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., center, talks to diners at Luis's Taqueria in Woodburn, Ore., Friday, May 9, 2008. (AP Photo/Jae C. Hong)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., center, and Abel Valladares, right, share a laugh while having lunch at Luis's Taqueria in Woodburn, Ore., Friday, May 9, 2008.
(AP Photo/Jae C. Hong)
A waiter, foreground, carries a food tray as Democratic presidential hopeful, Sen. Barack Obama, D-Ill., top center, chats with diners at Luis's Taqueria in Woodburn, Ore., Friday, May 9, 2008.
(AP Photo/Jae C. Hong)