Its not the first time Obama has been sexist
“She’s got the kitchen sink flying, and the china flying, and the, you know, the buffet is coming at me.” - http://www.npr.org/templates/story/story.php?storyId=89803183, starting at 2:05 and http://blogs.abcnews.com/politicalpunch/2008/04/obama-hillary-t.html
“I understand that Senator Clinton, periodically, when feeling down, launches attacks” - http://www.youtube.com/watch?v=_qNpeGPdhEw
“You challenge the status quo and suddenly the claws come out.” - http://blogs.abcnews.com/politicalpunch/2008/02/is-obama-using.html