WATERFORD, MI - JUNE 02:  Democratic presidential hopeful Sen. Barack Obama (D-IL) talks the the news media after visting with workers at the Rite Aid Distribution Center June 2, 2008 in Waterford, Michigan. Obama is campaigning in Michigan the day before primary contests in South Dakota and Montana, where he is polling ahead of his rival for the nomination, Sen. Hillary Clinton (D-NY). Getty Images logo Getty Images 13 months ago

WATERFORD, MI - JUNE 02: Democratic presidential hopeful Sen. Barack Obama (D-IL) talks the the news media after visting with workers at the Rite Aid Distribution Center June 2, 2008 in Waterford, Michigan. Obama is campaigning in Michigan the day before primary contests in South Dakota and Montana, where he is polling ahead of his rival for the nomination, Sen. Hillary Clinton (D-NY).