If you don’t know what SOPA and PIPA are, I urge you to visit this site. SOPA and PIPA, among other things, completely undermine the idea of due process, without which we might as well still be constituents of King George III.
If we want a government of the people, for the people, and by the people, SOPA and PIPA have to be stopped. If we want a government of the corporations, for the corporations, by the corporations, SOPA and PIPA are a tremendous jump in that direction.
Write your congressmen. You can do it from the site linked above. If you have certifications, sign off with them. Any little extra bit of weight you can throw behind your argument helps.
Copyrights can be useful things, but SOPA and PIPA have too many unintended consequences. It’s like treating an illness with hemlock. It’ll cure the illness, but there’s this one side effect that’s a doozy.