At TAPPED Tom Schaller says
One more, non-Post observation: Peter Beinart makes an interesting case that weakness (thought of in the sense of the most basic stereotypical gender norms) is, ironically, more of an asset today than it was back in 2002. Still, weakness is as weakness does. And the 2002 war vote, instead of making her look tough on defense, makes Hillary look like somebody too weak to stand up to a president and, thus, perhaps, too weak to be one. [emphasis mine-SJB)
I don't think the issue of "weakness" and the 2002 Iraq war vote was a matter of not being able to stand up to the president.
The issue was the member's voting calculation in light of media pressure and their own presidential ambitions amidst a time of fear and war-mongering. To the extent a Senate member's "yes" vote on the war was driven more by these calculations than their own independent judgment, then that member in my view demonstrated a profound "weakness" in their vote.