Not many of the Obama supporters I know.
Of course they were more willing to forgive it! That's going to be the case. Partly because humans don't like admitting they were wrong. Partly because it's legitimate to trade off issues against each other. Partly because we're introducing selection bias - if it's enough to turn you off Obama entirely, you're not an "Obama supporter".
But there's miles between overly generous forgiveness and support. It was commonly named as an area where they were disappointed in Obama.
Change that (which I support) and we can talk 3rd parties.
I supported Sanders 2016 primary and his 2012 primary threat to Obama, after having voted for Obama in 2008. Once the options became Obama (and now Clinton), I voted for those simply because the alternative means more coal, less regulations, and more religious right.