Hyper-leftist commentators are getting punked a lot lately. That’s what happens when one is constantly parroting talking points without bothering to fact check. Earlier this week David Shuster torpedoed his credibility (or whatever was left of it) by pushing the Media Matters narrative that Fox was banned in Canada. Punked. The latest punkee? Keith Olbermann. A few weeks ago some hack decided to accuse Rush Limbaugh, Sean Hannity, and Glenn Beck of using a service provided by the company that syndicates their radio shows: Premiere Networks (a subsidiary of Clear Channel). The job, the email indicated, paid $40 an hour,...