2008 Libertarian Party presidential candidate Bob Barr endorsed Sen. Russ Feingold (D) today in a radio interview:
What I look for in Washington are folks in the Senate and the House who put the Constitution first. Not the “R” or the “D”, not partisan politics but the Constitution. And what you have in Russ, and I have worked closely with him over a number of years to try to rein in the Patriot Act, to try to rein in the government surveillance and so forth – this is a man who understands the Constitution, who supports and fights sometimes against his own party to defend the Constitution in the Congress of the United States in ways that are much more consistent and much more proactive than a lot of Republicans.