I should have said that Wallis has been on as an Evangelical who criticizes other Evangelicals, which has made him very attractive for liberal talk shows.
The theory that Being should be biased because one side favors lack of bias doesn't entirely make sense to me. Whether liberals favor lack of bias or not (lack of bias was widely considered a central value in journalism and inquiry before the success of Fox made some people on both sides forget why bias is harmful), anyone who imagines liberals really are unbiased is fooling herself.
About your reference to "you people" (classic language of bias, by the way), I'm a liberal and detest Fox. My point is that Being should be less like Fox, i.e. less biased, not more. Unfortunately, it's possibly the most biased show distributed by NPR, with predictably harmful results for itself and its listeners.
More information about text formats