The political adviser who called Hillary Clinton "a monster" has resigned from Barack Obama's presidential campaign.

Samantha Power, an unpaid adviser to Obama's campaign, announced her resignation in a statement in which she expressed deep regret over her comments.

"Last Monday, I made inexcusable remarks that are at marked variance from my oft-stated admiration for Senator Clinton and from the spirit, tenor and purpose of the Obama campaign," she said. "And I extend my deepest apologies to Senator Clinton, Senator Obama and the remarkable team I have worked with over these long 14 months."

Power's comments were published Friday in a Scottish newspaper, even though she tried to keep it from appearing in print.

"She is a monster, too - that is off the record - she is stooping to anything," The Scotsman quoted her as saying.

As U.S. news media picked up on the remark, Obama's campaign decried the characterization.

Power, a Harvard professor, is the author of "A Problem from Hell: America and the Age of Genocide," which won the Pulitzer Prize for general nonfiction in 2003.

Democrats' Dream Ticket?

Obama and Clinton are preparing to face off in the Wyoming caucuses Saturday. Mississippi Democrats vote Tuesday.

While campaigning there Friday, Sen. Clinton raised the possibility of making Sen.Obama her vice president.

"I've had people say, 'Well I wish I could vote for both of you," she said. "Well, that might be possible some day."

Obama says talk of a joint ticket is premature.

McCain on the Trail

Meanwhile, Republican John McCain continues to campaign and raise money for the general election.

Today he held a town hall meeting at Chick-Fil-A's headquarters to talk about the economy and the need for more job training.

He also said President Bush's tax cuts that he originally opposed should be made permanent.

Source: CBN News, The Associated Press