I didn't offer a "proof." I offered a logical argument. 

In case you hadn't notice, Duke, we live in a Western democracy. We're surrounded by Western democracies. All our allies in the northern hemisphere are Western democracies. And in the southern hemisphere, all our allies are democracies as well. But regardless of where those counries are, none of them have an Islamist political party.

The claim that "Islam is as much a political movement as a religion," is rubbish.