I changed the boiler plate text in the email to say the following, which I believe has more of a punch:
I am a constituent and I urge you to reject the Internet Blacklist Bills (PROTECT IP Act in the Senate and the Stop Online Piracy Act in the House).
In addition to the danger these bills pose to Internet security, free speech online, and innovation, I am deeply concerned by the risk that these unprecedented assaults on foreign entities will be interpreted as a provocation of war, particularly by leaders who are already hostile towards US policies, such as Putin of Russia. This will be heavily compounded as this inevitably leads to harming sites that many will view as innocent victims of this highly subjective process and clearly biased intent towards increasing corporate profits in Hollywood.
This bill will also re-enforce the image that congress is purchased and own by corporate interests.
Lastly, due to the sweeping level of censorship, this bill will popularize methods of overcoming censorship to the US, technology that is usually reserved for hardship regimes. This will certainly make it difficult for the intelligence community to find real crimes, as their chatter becomes increasingly co-mingled with mainstream on-line anti-censorship technology.
The Internet Blacklist Legislation is dangerous and short-sighted, and I urge you to join Senator Wyden and other members of Congress, such as Representatives Lofgren, Eshoo and Issa, in opposing it.