Where does he suggest otherwise? He's making a simple point about the nature of money with an apt analogy to a relevant federal statute. Of course it's politically motivated insofar as it makes no sense to be talking about this if you don't accept the premise that abortions are bad and breast cancer screening, etc., is good. You point out a lot of distinctions between PP and terrorist organizations (though I'm not sure all of those distinctions apply to every charity that has been identified by the US as a supporter of terrorism, but that's beside the point), but how are they relevant. Again, he never said that PP is a terrorist organization. He said that both PP and terrorist-supporting charities both perform "good" and "bad" activities, and you can't financially support one without supporting the other. I've yet to see how that's false (again, granting for the sake of discussion his premise that funding abortion is bad).