My guess is he'll build towards some policy proposals and try to court the professor's audience on a targeted set of issues. He stands a lot to gain by talking politics, though I'd generally stick to the politics of IP. If he wanted to do posts on more generic topics he already has a forum at BlogForAmerica, where some of the regulars are actually horked that he's posting to another site. The point of guesting on someone's blog is to bring your insight to their topic, you know?