Here is The Actual Quote (in context)
DIANE SAWYER, ABC NEWS: (OC) You said that, that Mrs. Bush at one point had said to the two of you, don't watch too much TV. You may be watching too much TV.
FORMER FIRST LADY BARBARA BUSH, UNITED STATES: No question.
DIANE SAWYER, ABC NEWS: (OC) You do watch?
FORMER FIRST LADY BARBARA BUSH, UNITED STATES: I watch none. He sits and listens and I read books, because I know perfectly well that, don't take offense, that 90 percent of what I hear on television is supposition, when we're talking about the news. And he's not, not as understanding of my pettiness about that. But why should we hear about body bags, and deaths, and how many, what day it's gonna happen, and how many this or what do you suppose? Or, I mean, it's, it's not relevant. So, why should I waste my beautiful mind on something like that. And watch him suffer.
rl> As anyone can plainly see... she is saying that the "suppositions" aren't relevant.