Agree. And none either employed by or financially dependent on government money. (That BTW would eliminate nearly everyone within the DC Beltway and for some distance beyond.)
Then again, Libby wasn't an elected official. Need to clarify my prior statement to include immediate staff of nationally elected officials.
"And none either employed by or financially dependent on government money. "
Or any media company, radio/TV/Newspaper, etc. Political trials are just too volatile and emotional.
Libby was not an elected official.
Assuming your suggestion was constitutional, would you be willing to sit on a jury for a month or so in DC because no one on the government payroll was able to do so?