With a sparkling intellect, a mane of auburn hair and a Pulitzer Prize-winning book to her credit, Samantha Power cut a disarming path just about anywhere she went.
Power's ebullient style won over many journalists, diplomats and one presidential contender. But outspokenness became her undoing, forcing Power on Friday to quit Illinois Sen. Barack Obama's presidential campaign after publication of an interview in which she called his Democratic rival, New York Sen. Hillary Rodham Clinton, "a monster."
The 37-year-old Harvard professor and Time magazine columnist gave up her position as a foreign policy advisor to Obama and apologized for describing Clinton in "such negative and personal terms."
But that was not the only Power-related trouble for Obama. Comments about his Iraq stance that she made earlier during an overseas book tour forced Obama on Friday to repeat to the public that if elected he would withdraw troops from Iraq and "bring this war to an end in 2009."
At the end of another day of distraction for his presidential campaign, Obama had lost one of his earliest, and certainly most charismatic, advisors. And Power saw her comments open a new line of attack for Clinton.
Experts said she might have lost her way at the fuzzy intersection of her roles as author, journalist and campaign operative. "If you are a book writer promoting yourself and your work, you are supposed to be provocative and interesting and tell the truth," said Tom Rosenstiel, director of the Project for Excellence in Journalism. "Candidates are not there to speak the truth in all of its glory. They are there to win an election."
The Power contretemps came just a week after another controversy erupted over whether Obama's top economic advisor had told Canadian officials that Obama did not fully embrace his own attacks on the North American Free Trade Agreement.
The missteps distracted from the candidate's effort to regain momentum after losing primaries Tuesday in Ohio, Texas and Rhode Island.
"The problem for them is having a couple of these missteps at exactly the wrong time," said Joe Trippi, who was a top strategist former Sen. John Edwards' now-defunct presidential campaign. Although he called attacks by Clinton on Obama's foreign policy experience "unfair," Trippi added: "It's not a good thing to have one of your leading foreign policy proponents saying things that you have to back away from or explain."
Obama and his erstwhile advisor met in 2005, after he became intrigued by her prize-winning "A Problem From Hell: America and the Age of Genocide." The two talked late into the night at a steakhouse, much of the conversation centering on her belief that the United States should have done more to stop the devastating killing in Darfur and other places.
If Obama has been dubbed the "rock star" candidate, Power might have been his rock star advisor. Born in Ireland and schooled at Yale and Harvard Law, she was founding executive director of the Carr Center for Human Rights Policy at Harvard. The Times of London said she would have fit right in with the Kennedy clan. She once played basketball with actor George Clooney, a fellow Darfur activist.
A member of Obama's inner circle, Power was an unpaid advisor. She had previously confided to friends that she had ambitions to one day be secretary of State.
Her troubles began when she traveled to Britain to promote her latest book, "Chasing the Flame: Sergio Vieira de Mello and the Fight to Save the World," a biography of the dashing U.N. envoy killed at U.N. headquarters in Baghdad in 2003.
In a freewheeling interview conducted by the Scotsman newspaper, Power used an expletive to say the Obama campaign had blown the recent primary in Ohio. She suggested voters there had become "obsessed" with the economy and said Clinton had played on those concerns.
"She is a monster, too -- that is off the record -- she is stooping to anything," Power told political correspondent Gerri Peev. She added of Clinton: "The amount of deceit she has put forward is really unattractive."
Peev followed a standard journalistic practice in requiring interview subjects -- particularly political operatives -- to reach agreement in advance if they want to keep matters out of the public domain.
Peev said in an interview Friday that she found Power "intelligent and likable" but that "it would be a disservice and dereliction of duty if I didn't run the quotes I have on my tape recorder."
Power said in a statement: "I made inexcusable remarks that are at marked variance from my oft-stated admiration for Sen. Clinton and from the spirit, tenor and purpose of the Obama campaign. And I extend my deepest apologies to Sen. Clinton, Sen. Obama and the remarkable team I have worked with over these long 14 months."
In a subsequent interview with the Boston Globe, Power said she had been tired from an overnight flight and disturbed by news she received by phone during the interview about Clinton campaign tactics.