By Bob Brigham The credibility of Fox News was called into question after former George W. Bush White House press secretary Dana Perino pushed a bogus story about a competitor. Writing under the headline, “Always be wary of Fox News,” Washington Post media critic Erik Wemple wrote about a new poll the newspaper conducted with ABC News. “I thought it was amazing that ABC News would do this poll, commission a poll, work on the poll, and then not report on the poll,” said Perino. “That was pretty amazing to me that they would bury it that way, because it is super bad news for the president, espec…