There really was nothing else for her to do than to resign after becoming a liability to the Obama campaign :

Samantha Power, an unpaid foreign policy adviser and Harvard professor, announced her resignation in a statement provided by the Obama campaign in which she expressed "deep regret."

"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."

Previously : "She's A Monster".