George Will should not use the phrase "non sequitur."  He writes:

Some liberals argue that the Constitution is unconstitutional. Their reasoning is a non sequitur: The Constitution empowers each chamber to "determine the rules of its proceedings." It requires five supermajorities (for ratifying treaties, endorsing constitutional amendments, overriding vetoes, expelling members and impeachment convictions). Therefore it does not permit requiring a sixth, to end filibusters.

No one I know of argues that–and Will doesn't try to cite anyone.  It's a dumb argument, after all.  So he's right about that.  He ought to know, of course, because that is precisly Will's argument against everything else about government he doesn't like.  Since the Constitution doesn't expressly provide for it, it doesn't exist.  There is no right to x, because the Constitution doesn't say so. 

Now since no one argues for this silly view (other than Will), it's a perfect example of the hollow man.  Note the use of "some."    

Thanks to Aaron at the Stopped Clock for the hat tip, the pointer, and for generally reading this blog.