The former senator from New Jersey said Sunday in an appearance on NBC's "Meet the Press" program that superdelegates, some 700 party insiders and elected officials, ought to back whomever their constituents supported in their state's primary contest: Hillary Clinton or Barack Obama.

"I think a lot of superdelegates will honor what their constituency said," said Bradley,an Obama supporter. "Every superdelegate makes a decision about what's good for the country, what's good for the party, and what's good for themselves."

On whether Michigan and Florida should hold do-over primaries, Rep. Nita Lowey, D-N.Y., a Clinton supporter, said on the program that a mail-in vote won't work in Florida but the state may decide on a new all-out primary if Michigan decides to hold one.

"I think the adults that are sitting at a table figuring this out in both states are going to come to a decision to have a revote," she said. "The mail vote, according to most of the people I speak to in Florida, the write-in vote, will not work, and I think they will have to revote, and there are already people who have agreed to pay for it."