Former CBS reporter Sharyl Attkisson appeared on MSNBC's Morning Joe and continued to lob accusations of bias at her former employer while offering no evidence to substantiate her charges.

Since leaving her former job as an investigative correspondent for CBS' Evening News, Attkisson has engaged in a media blitz notable for two goals: promoting her upcoming book and leveling substance-free accusations. In her appearance on Morning Joe on April 22, Attkisson continued this trend, suggesting that the lack of interest on the part of CBS News in pursuing some of her stories was due to political bias.

When offered an opportunity by co-host Mika Brzezinski to substantiate her claims, however, Attkisson refused, saying: 

ATTKISSON: I decided for many reasons not go into a lot of detail. I'll probably write about some of this in the book when I can think it out and word it carefully. But it was just, to me, a huge variety of stories, and I'm certainly not the only one complaining about that, and it's not the only network where correspondents think this sort of thing is going on.

Attkisson's campaign of evidence-free accusations has been praised by the right, but has come under fire from media critics. Washington Post's Erik Wemple pointed out that both Attkisson's accusations of bias and her attacks on outlets such as Media Matters “rest on uncorroborated stuff”:

In any case, Attkisson's claims against CBS News rest on uncorroborated stuff, as do her claims against Media Matters, as do certain of her suggestions about intrusions into her computers (though she promises news on that front). The more media interviews she does, the more she thrusts this un-journalistic tendency into the public sphere for the inspection of prospective employers. And the more she all but compels CBS News to strike back at her ramblings.

Invited to do just that today, CBS News spokeswoman Sonya McNair told the Erik Wemple Blog: “CBS News maintains the highest journalistic standards in what it chooses to put on the air. Those standards are applied without fear or favor.”