I'm not a fan of Zinnia Jones anymore because she used her testimony to gather publicity for herself. In my opinion, it hurts the defense when you have one of their witnesses doing Q&As on the trial on tumblr or twitter (I forget which one). Usually it's best to keep things out of the public eye until the trial; otherwise, the prosecution has a huge advantage. I know she has defended her pre-testimony social media Q&A, but I thought it was tacky and harmful to Manning's defense.
In any event, I do agree with this letter and find it shameful that CNN won't do the right thing. I'm not a fan of the network, but one would hope they would have the decency to give Manning the respect she deserves as a human, regardless of her prisoner status. I didn't know NPR followed suit which is a shame because I love their coverage.