To put it another way, moving domains as a way of expressing displeasure over SOPA legitimates the very logic which created it; that internet users in the US are merely consumers, not citizens. Move your domain day id premised on the idea that consumer choices are our most effective political act and accepting that premise is done at the peril of losing our legitimate political power.
supreme executive authority derives from a mandate from the people, not some farcical shopping ceremony to paraphrase Dennis.