Obama adds superdelegate

Barack Obama added another superdelegate today, capitalizing on his big win Tuesday in North Carolina to gain the backing of another of the state's congressman.

The endorsement from Brad Miller, who represents a district that includes the state capital of Raleigh, continues to narrow Hillary Clinton's lead among superdelegates -- the only metric where she still has an advantage over Obama.

“Senator Obama understands that he has the chance not just to win the election this year, but to be a great president," Miller said in a statement issued by the Obama campaign.

"Americans know that Republican policies have failed because their ideas are wrong. Americans know that our government has not acted, to use Franklin Roosevelt’s words, as trustees for the whole people, but have taken the side of powerful economic interests on every issue. Americans want a fundamental change in course. Senator Obama has seized that opportunity."