Democratic presidential hopeful, Sen. Barack Obama, D-Ill., left, talks to his communications director, Robert Gibbs, on his campaign charter at Midway International Airport in Chicago,Wednesday, May 7, 2008.
Gallery: On the Trail
Michael Cryor, who heads the Maryland Democratic Party and is a superdelegate supporting Barack Obama, says he thinks it's time for superdelegates to declare which candidate they will support.
Obama created a stir Thursday in an unannounced visit during House votes that lasted more than half an hour. He was surrounded by well-wishers calling him, "Mr. President" and reaching out to pat him on the back.
The Illinois senator told reporters afterward that he was asking members of Congress to support his White House candidacy. He said he wants to bring the party together behind him as soon as possible, but he recognizes he'll have to keep on working to finally defeat Hillary Rodham Clinton.
He said Clinton is a formidable candidate who is likely to win West Virginia and Kentucky, which vote in the next two weeks.