What bill are we talking about?
It's S. 3804, the Combating Online Infringement and Counterfeits Act (COICA), introduced by Sen. Patrick Leahy (D-VT) and Sen. Orrin Hatch (R-UT). It's currently being considered by the Senate Judiciary Committee.
What exactly does it do?
The bill creates two blacklists of Internet domain names. The first can be added to by a court, the second by the Attorney General. Internet service providers (everyone from Comcast to PayPal to Google AdSense) would be required to block any domains on the first list. They would also receive immunity (and presumably the government's gratitude) for blocking domains on the second list.
Please read more about this bill and sign the petition here:
COICA Fact Sheet | Stop the Internet Blacklist! | Demand Progress
The government has no right to determine which websites we may access and which we may not. This is not a partisan issue.