At first it was "Obama didn't consult congress, it's unconstitutional". That didn't resonate and the red meat righties couldn't relate to the notion of a President being bound from war by anything silly like collaboration.
So now it's mission confusion, incompetent leadership, and "we don't know who we're supporting and these guys might be Al-Qaeda, Muslim brotherhood, bad Arab kind of people", implication being Obama supports terrorists and, if you're really good at hearing the dog whistle, a secret Muslim.