A key foreign policy adviser to Barack Obama quit today over controversial criticism of about Hillary Clinton.
Samantha Power, a professor at Harvard, resigned from the campaign after comments to a Scottish newspaper disparaging Clinton and assailing her tactics.
"She is a monster, too -- that is off the record -- she is stooping to anything," Power, a Pulitzer Prize winner for her book about America's failure to stop genocide, said in the Scotsman.
Earlier today, Power issued an apology, saying she "deeply regretted" the comments.
"It is wrong for anyone to pursue this campaign in such negative and personal terms," she said in the statement.
But after Clinton supporters called for her to step down, she stepped aside from her unpaid role.
"With deep regret, I am resigning from my role as an advisor to the Obama campaign effective today," she said in a statement. "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. And I extend my deepest apologies to Senator Clinton, Senator Obama, and the remarkable team I have worked with over these long 14 months."
UPDATE: Power, in an interview Thursday on BBC during her ill-fated trip to England, talked at length about Obama's plan to withdraw US combat troops from Iraq within 16 months of taking office. She called it a "best-case scenario" and said he would revisit the pledge after taking office.
Power is the second foreign policy adviser to give Obama heartburn.
Earlier this week, Susan Rice, a former Clinton administration official, told a TV interviewer that neither Obama nor Clinton is ready to take the proverbial 3 a.m. international crisis phone call in the White House -- not exactly on message.