The "liberal media" is just a way of blocking out information that some do not want to hear. The process goes like this: "This information does not conform with what I believe is the case or wish to be the case, but I do not have to pay any attention to it because it is from the 'liberal media' and therefore untrue." There is no limit to the devices average people will employ to avoid having to confront uncomfortable questions regarding their tightly held beliefs. Many here in the US are so emotionally invested in the correctness of the war that they cannot admit the possibility of being wrong. Too painful. Must be that the bad news is just wrong. Hence, the "liberal media." If that doesn't work it is back to the old fall-back position of "stabbed in the back at home" which one sees in this quote, one hears regarding the war in Vietnam and one saw with devastating effect in Germany in the 1920s and early 30s.