I don't think there is any doubt that SOPA has the potential to kill the free and open internet as we know it, which is kind of the point.
If he's getting his political information from internet news sites (reddit.com's r/politics?), I would advise him to look a little more deeply into Ron Paul's actual positions, which he might find surprising.
If he's internet savvy and wants to find good books on political science, he should probably look online at the lists of required texts for political science courses at good universities that are known for their strong poli-sci programs, and then start with ones that appear on most of those lists.
