According the the ABC News website, Senator Hillary Clinton claimed, in response to a heated question from the audience, she didn't really understand what she was voting for in October 2002 when she voted for the war in Iraq:

Clinton also said she believed she was giving the President the authority to send U.N. inspectors to Iraq.

The legislation Senator Clinton voted for was called "Authorization for the Use of Military Force Against Iraq".

So did she really get confused by that, or is she being weaselly and dishonest about it now, hoping she can dupe enough people to win the nomination? Of course this question is rhetorical. On the other hand, since being dishonest about the war in Iraq is standard Democratic party fare now, primary voters may have to decide based on some other criteria.