If you think SOPA will only affect people who post pirated movies or music, think again, SOPA could affect you if you post or quote a simple news article. How many people are fully versed in Fair Use law? How much of an article can you use before it's copyright infringment? If you go beyond it, a law like SOPA can shut down not just you but the entire site you are posting on. The Associated Press has gone after bloggers before for using too much on an AP article in their post and using DMCA to have posts taken down, imagine what they could do if SOPA passed and they can make that claim and take down a site, with no hearing needed.
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