Edited sentence: Critics contend that there are many outlets for liberal voices in talk radio; that attempts to create "balance" on talk radio, such as The Fairness Doctrine, violate The First Amendment; and that media and institutions dominated by liberals -- including the mainstream media, Hollywood and academia  -- will not be subject to similar restrictions.The liberal/progressive Center for American Progess has been criticized by numerous conservative commentators for their report titled "The Structural Imbalance of Political Talk Radio"