With 90 percent of Maine’s precincts reporting, Mr. Obama received 58.7 percent of the vote, compared with 40.7 percent for Mrs. Clinton.

Voter turnout in parts of Maine was reported to be strong on Sunday afternoon, despite a snowstorm. The Portland Press Herald reported on its Web site that there were long lines at the caucus in Portland, while a large crowd in Cape Elizabeth delayed the start of the caucus there by more than an hour.

Mr. Obama’s victory in Maine follows those in Washington, Louisiana and Nebraska on Saturday. Combined with his advantage in fund-raising, these victories should give him momentum going the primaries on Tuesday in Virginia, Maryland, and Washington, D.C.

Mrs. Clinton’s defeat in Maine came on the same day as her campaign manager stepped down. A Clinton spokesman said the departure of Patti Solis Doyle as campaign manager was not a shakeup, and Ms. Solis Doyle said in an e-mail statement that she would serve as a senior adviser to the campaign. She will be replaced by Maggie Williams, another senior adviser to the campaign.

In the Republican contests on Saturday, Mike Huckabee won the caucuses in Kansas and, by the barest of margins, the Louisiana primary, in a setback for Senator John McCain as he tries to rally the party around him as its nominee. But in Washington, the state party declared Mr. McCain the winner of its caucuses on Saturday night, after a close race with Mr. Huckabee.

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