Do the major media outlets in the U.S. have a liberal bias? Few questions evoke stronger opinions. So far, the debate has largely been one of anecdotes (“How can CBS News be balanced when it calls Steve Forbes’ tax plan ‘wacky’?”) and untested theories (“if the news industry is a competitive market, then how can media outlets be systematically biased?”).

This study attempts to quantify the Liberal or Conservative measure of several prominent media outlets.

Others have critically analyzed their findings and call into question where they draw the line between conservative and liberal.

A good discussion thread on the study can be found at the Dead Parrot Society.