I believe CNN overall has a definite liberal bias. However, in this instance I believe the headline was referring to what Reagan said about insanity being hereditary. I believe some of the WND readers took CNN’s headline out of context.
You said: I believe some of the WND readers took CNN’s headline out of context.
***
I think readers took CNN’s headline out of context because that headline WAS out of context. It suggested that the essence of the story was different than what the story in fact was about. In the greater scheme of things it is not that big a deal, it is just further proof of CNN’s bias against Reagan and conservatives.