Advisers said yesterday that they had begun corralling donors to build quickly on the formidable $14 million that Mrs. Clinton already had in the bank. They predicted that they would outpace Mr. Obama, though they acknowledged that he is moving impressively to try to match Mrs. Clinton’s national fund-raising network, which has been in the making far longer than his.

Mrs. Clinton faces some fatigue among donors after more than 15 years of Clinton fund-raising, Democratic contributors and strategists said, and some skepticism about whether she can win. Yet she has the Democrats’ most popular rainmaker at her full disposal, former President Bill Clinton, and she has influential friends like the lawyer and power broker Vernon E. Jordan Jr. to help keep African-American donors and others by her side.

Notably, no prominent Clinton fund-raiser has moved to Mr. Obama’s camp (though his aides are working on it). Mrs. Clinton has also lined up a powerful roster of fund-raising and economic advisers in New York, including the financiers Roger Altman, Steven Rattner, Blair W. Effron, Alan Patricof and Mr. Rattner’s wife, Maureen White, a former finance chairwoman of the Democratic National Committee.

“Maureen and I will happily do everything we can to help her,” Mr. Rattner said. “Based on our long relationship with her, we feel that she has demonstrated incontrovertibly that she would be an effective candidate and a terrific president.”

For all of the attention swirling around Mr. Obama, meanwhile, he faces many obstacles as he seeks to become the nation’s first black president. His background, including a father from Kenya and a mother from Kansas, has elevated his appeal, but it does little to answer questions about whether he has the experience to serve in the White House.

Picking off Clinton loyalists is no easy task, either. Hours after opening his fund-raising committee on Tuesday, Mr. Obama convened separate conference calls with donors in Chicago and on the East and West Coasts; in the East Coast phone call, according to participants, Mr. Obama asked them to keep an open mind about his candidacy even if they had been allies of Mrs. Clinton.

Image Clintons Web site, HillaryClinton.com, Saturday morning.

James Torrey, chairman of the global hedge fund Torrey Funds, said he signed on with Mr. Obama not as a snub to Mrs. Clinton, but because he believed that the Illinois senator had the best chance of inspiring Democrats and other voters.