WASHINGTON -- Supporters of Sen. Hillary Clinton suggested she would like to be Sen. Barack Obama's running mate, but close advisers to Sen. Obama are signaling that an Obama-Clinton ticket is highly unlikely.

Some in the Clinton camp also noted a possible deal-breaker for a party-unity ticket: Bill Clinton may balk at releasing records of his business dealings and big donors to his presidential library.

Sen. Clinton scheduled a gathering for her staff at her house Saturday, where she will end her campaign and concede the nomination, three advisers said.

A day after his history-making declaration that he had enough delegates for the nomination, Sen. Obama on Wednesday named a search team for a vice-presidential running mate. The first African-American nominee for a major party tapped two high-profile supporters—Caroline Kennedy, daughter of the late President Kennedy, and Eric Holder, President Clinton's former deputy attorney general. They join Jim Johnson, a former Fannie Mae chairman, who had already been enlisted to lead the search and vet potential choices.