Samantha Power damage spreading in Obama campaign

I see that Samantha Power has now resigned from the Obama campaign.

From a previous BBC interview that has come to the attention of the media and the Clinton campaign, it now seems she expressed doubt about Obama's ability to withdraw from Iraq within 16 months. This undermines his stated anti-war stance of a quick withdrawal. Here's the story which was also cited in the NYT.

This is arguably even more embarrassing to the Obama campaign because it undercuts one of his perceived advantages over HRC.