A transcript of what each candidate said: Source
Gingrich: "You are asking a conservative about the economic interests of Hollywood? I am weighing it and thinking fondly of the many left wing people that I am so eager to protect. On the other hand, you have so many people that are technologically advanced such as Google and You Tube and Facebook that say this is totally going to mess up the Internet. The bill in its current form is written really badly and leads to a range of censorship that is totally unacceptable. I believe in freedom and think that we have a patent office, copyright law and if a company believes it has generally been infringed upon it has the right to sue. But the idea that we have the government start preemptively start censoring the Internet and corporations' economic interest is exactly the wrong thing to do."
Romney: "The law as written is far too expansive, far too intrusive and far too threatening of freedom of speech and information carried across the Internet. It would have a depressing impact on one of the fastest growing industries in America. I care deeply about intellectual content going across the Internet and if we can find a way to very narrowly go after those people who are pirating especially those offshore. But a very broad law that gives the government the power to start saying who can pass what to whom, I say no and I am standing for freedom."
Paul: "I am one of the first Republicans to oppose this law and so glad that sentiment has mellowed up here as Republicans have been on the wrong side of this issue and this is a good example on why its good to have someone who can look at civil liberties ... freedom and the constitution bring people together."
Santorum: "I do not support this law and believe it goes too far. But I will not agree with everyone that there isn't something that should be done to protect the intellectual content of people. The internet is not a free zone where anyone can do anything they want to do and trample the rights of other people. Particularly when we are talking about entities off shore. The idea that the government has no role to protect the intellectual property of this company, that's not right. The idea that anything goes on the Internet? Who has that idea. Property rights should be respected."