I've been over this a few times already, but
Mother Jones's David Corn
delves into more detail and concludes: "Clinton and her aides have been peddling false information about Obama to undercut one of his primary arguments: she voted for the war; I was against it. Engaging in such disingenuous attacks may help Clinton beat back Obama, but it is hardly the way for her to counter Obama's claim that she represents poltics-as-usual. It only proves his point."
This article available online at:
http://www.theatlantic.com/politics/archive/2008/01/clinton-obama-iraq/47923/