It's not about forgetting it as much as questioning its specific relevance. Jeb Bush is basically saying "I supported it with the knowledge at the time just like my brother and Hillary" to throw jabs at Hillary with her base like Obama did. Are people going to make their decision on Iraq? Sanders is trying to use it on Hillary:
http://www.theguardian.com/us-news/2015/may/10/bernie-sanders-hillary-clinton-trans-pacific-partnership but we know that's not going to make much of a dent. I was looking for if any of the other candidates had taken stances and came across Jonah Goldberg making this point:
The weird thing is, Ms. Clinton has far more responsibility for the Iraq War than Jeb Bush does. Meanwhile, none of the potential GOP presidential hopefuls voted for the war in 2002. Scott Walker was the Milwaukee County executive; Marco Rubio was in the Florida House of Representatives; Chris Christie was a U.S. district attorney;Ted Cruz was a policy wonk at the Federal Trade Commission; Rand Paul and Ben Carson were practicing surgeons. And so on.
Ben Carson has questioned the morality of Iraq AND Vietnam. Rand Paul would probably take a stand against it if pressed. Walker can toe that line Huckabee has with the "what matters is how we deal with it now." Cruz and Rubio have that out too. Though they all seem to be in favor of fighting ISIS with ground troops. Hillary hasn't really taken a clear stance on what to do with ISIS. Santorum and Graham were both for it and Graham is for anything with men in uniforms. Nobody cares what Fiorina thinks. Perry and Jindal have spoken favorably in the past. I think Trump was against it and then for it and then against it and then for it and then against it.
Just seems like it's not anywhere near as relevant as in 2008. Where it played a role in both primaries as a referendum on the Bush years of sorts.
Then you got Gary Johnson, Jesse Ventura, Jill Stein and Bernie Sanders as all obviously against Iraq.
Hillary's got the foreign policy experience to where they basically have to run an anti-incumbent campaign against her, and after the last eight years, I don't think her Iraq War vote is going to do it. Benghazi probably literally has more attack power to it.