I forgot to mention, 'cause I think it goes without saying but... For completeness sake...
When online through your "clean" system like that never, ever access any online accounts (email, bank, blog, etc.) that can be traced to you, or that you have ever used from your "home" computer. Similarly, from your home computer never ever access your "private" accounts that you sign-on to from your "clean" system. You want to leave no linkage between the two online identities.
A lot of hassle — in principle it might be possible to tie different spots to different kinds of activities, but just forget once while you’re sitting at McDonald’s and it’s all blown.
I doubt even a second term Obama would attempt to actually shut down FR. It’s pretty darn mild when compared to sites like the DUmmies. (We don’t cuss or get potty mouth, much, and don’t smoke except in the back room.) He’d need the pretense, at least, to help avert getting impeached.
By the way, I wonder if somebody will come up with WiFi dongles with dynamically programmable MAC addresses. Or drivers that do the equivalent. That would probably be the most practically useful way of covering your tracks, it would be like coming from a completely new computer each time.