Rejecting submissions from SOPA supporters on a private website just isn't the same as manipulating the machinery of government the way bill supporters have done.
But to your point, I wasn't commenting on the manipulation of government (a point that I also don't agree with - I think the government is complicit, not manipulated) but on the manipulation of technology to stifle freedom of expression. I don't see a huge difference between building filters that target torrent sites and building filters that target SOPA supporters. Nor do I think it makes a difference whether this is initiated in response to legislative demands, or some sense of "what is right".
Rejecting submissions from SOPA supporters on a private website just isn't the same as manipulating the machinery of government the way bill supporters have done.