Ahem. Russ Feingold is best known for his collaboration with John McCain on campaign finance reform, but was the only senator to vote against the Patriot Act the first time (joined by a few others the second time). Voted against the Iraq war. One of 3 Democrats to vote against Geithner as Treasury secretary. Fought pork, returned his raises to the government. Voted against dismissal of impeachment charges for Clinton, brought a resolution to censure George W. Bush for illegal wiretapping. After losing his seat to a Tea Partier, he formed a PAC, Progressives United, which has opposed Citizens United, Wall Street and SOPA, and calls out the Democrats when their spine softens, but was just shipped off to an African ambassadorship.

Etc. I love this guy. http://en.wikipedia.org/wiki/Russ_Feingold