I've seen many posts from tptacek and he often comes across as a shill repeatedly warning people about Democratic intentions.
He makes the usual partisan comments about Democrats but without going into specific detail, and usually follows up with something along the lines of saying he's a Democrat or donates to them. And I usually he presents the non-argument that much of what is in this bill was already lawful.
"you probably should be careful about cheering CISPA's demise."
I really don't trust anyone who takes the fear defense of a piece of legislation that seems to have more flaws than benefits, along with 'already lawful' measures.
If he were simply saying don't trust Republicans or Democrats, I don't think most people would disagree. I wouldn't.
Edit: I think the point that all he says is "be warned about Democrats they support this" without any examples or citations repeatedly is an important point, as it's lacking substance and comes across as spammy by HN standards.