BlackoutCongress.org speaks directly to lawmakers with the following:
You have conducted mass surveillance of everyone illegally and are now on record for trying to enact those programs into law. You have presented Americans with the false dichotomy of reauthorizing the PATRIOT Act or passing the USA Freedom Act. The real answer is to end all authorities used to conduct mass surveillance. Until you do, thousands of web sites have blocked your access, and more are joining every day.
If you’d like to keep Congress from accessing your site, the organization has provided a snippet of code on their page, which you can add to yours. It will redirect any Congressional IPs to a protest page.