It's fashionable these days for conservatives to suggest that the troubles currently afflicting daily newspapers can be traced to the persistent left-wing slant of most pubs in this category -- an ideologically driven argument that Boston Globe columnist dismantles in a piece headlined "Liberal Bias Isn't Killing Newspapers." His examples include a local one: "How does liberal bias explain the shutdown of Denver's more conservative Rocky Mountain News, but not the more liberal Denver Post?" he asks. As for the real culprits, he points his finger at the rise of the Internet, Craigslist and the explosion of info-dissemination operations whose products are typically free. "The culture has changed," he writes. "Only 15 percent of Americans younger than 40 now read a printed newspaper every day. It isn't political bias that keeps them away. Conservatives who insist otherwise do themselves no favors."