His decisive victory in North Carolina shows he can rebound from setbacks, analysts say.
His lead in North Carolina is dwindling, but he's closing in on Senator Clinton in superdelegates.
Obama and Clinton are in a tight race heading into the May 6 contest.
His big lead in North Carolina slips heading into May 6 primary; exodus of whites cited.
Many understand, but some may doubt Obama's 'blackness.'
Obama's former pastor launched a public-relations blitz.
Readers write about Barack Obama's former pastor.