Yes, Ron Paul has poorly handled the newsletters, but if you watch the actual interview, the interviewer was a guy who was clearly looking to score a point with her left-wing "everyone on the Right is a racist" friends.
Regarding Newt, his qualifications are being a Big Government RINO who has accepted lobby money from GSEs and then lied about it... that is AFTER his unethical financial behavior in the House, after being the only House Speaker to be censured, etc.