His big lead in North Carolina slips heading into May 6 primary; exodus of whites cited.
Minimal cost savings, increased dependence on foreign oil, and high administrative costs are among reasons why this idea ran out of gas.
His plan is at odds with a bipartisan bill backed by Clinton and Obama.
Many understand, but some may doubt Obama's 'blackness.'
Bush and Democrats in Congress disagree on how much onus to put on individuals vs. financial, energy industries
Obama's former pastor launched a public-relations blitz.