A court that takes a free speech absolutist position in one case is more likely to protect other forms of speech, not less. I'm an extreme civil libertarian and I strongly supported the Citizens United ruling.
There's no constitutional reason that the bill of rights should extend automatically to corporations (nor to robots or inanimate objects, for that matter). I'd be suspicious of any court using a first amendment argument to protect corporate interests.
If I have free speech rights, and if you have free speech rights, why should we not have free speech rights if we form a corporation and speak with one (amplified) voice?
Do you also believe that non-profits and churches should be able to freely lobby? Currently both are severely curtailed in their political speech, unlike for-profit corporations. This is why there are two ACLU organizations: http://www.aclu.org/american-civil-liberties-union-and-aclu-...
If SOPA passes, I hold out very little hope that this Supreme Court will do much of anything to ameliorate it .