Chamber of Commerce Threatens Senators that Oppose SOPA

From Macworld:

“On the other side, giant trade group the U.S. Chamber of Commerce, a strong supporter of PIPA, said it would be watching the upcoming vote and warned that it would include senators’ votes in its annual scorecard, which grades lawmakers on a handful of important votes each year.”

The US Chamber of Commerce also refuses to list its members. I wonder why?

Luckily, there are some groups watching the chamber. Unfortunately they spend the most when purchasing votes in the Senate and House.