Rush may not have believed O to be eligible, but he had no solid proof at the time.
Probing the birther issue suffered the same malady that afflicts probing most issues. Lack of understanding.
The lack of understanding facilitates establishing multiple blind-alley misdirection.
Scooter Libby - first question should have been "was Plame covered under the statute?" Actual progress was "who leaked?"
Obama eligibility - first question should be "what constitutes eligibility?" Actual progress was "Where was he born?"
The debate that should have happened, didn't, and Limbaugh was complicit in avoiding the "correct order of inquiry."