Clinton's hopes to use Ohio as a firewall in her falling campaign suffered another blow today when former Cleveland Mayor Michael R. White, who had earlier backed Clinton, also endorsed Obama.

"As an African American, I am proud to see Barack Obama make such an extraordinary effort to become the president of the United States," he wrote in the Cleveland Plain Dealer. "But being black is not enough for me to vote against my friend. I am voting for Barack because he has rekindled my hope again through his experience, vision and leadership for change in a political system that has gone so awry."