Appearing on NBC's "Meet the Press," Terry McCauliffe said it is still possible for Clinton to win the nomination, even though most pundits have concluded that she cannot overtake her rival, Illinois Sen. Barack Obama, to become the Democratic Party nominee.

"Look, tomorrow -- something new could happen," said McCauliffe. "Nothing's impossible. You are talking to Terry McAuliffe. I don't believe anything in life is impossible."

McAuliffe argued that Clinton would be a stronger candidate than Obama against Sen. John McCain, the likely Republican nominee. He said she would beat McCain in Florida, a major swing state.

Sen. Chris Dodd, D-Conn., who endorsed Obama after abandoning his own presidential campaign, said he expects Clinton and her supporters to rally behind Obama if and when Obama when he becomes the nominee.

"This is not 1968 when we were highly divided, racial tensions in the country, the anti-war movement, Democrats split over those issues," Dodd said. "The difference between Hillary Clinton and Barack Obama on substantive issues is rather narrow."