Nope, you don't. "Honest about his economic numbers" doesn't mean making up numbers, it means distorting his interpretation of them for political purposes. I have NO reason to trust Roberts. I have plenty of reason to distrust him.
I have reason to think he knows his topic, according to his bio, posted earlier. Because he apparently doesn't think much of President Bush, he is therefore using his credentials to outright lie and distort the effects of the current economy under Mr. Bush because of that opinion of him.
Does that sum up your objections?