is to whether Biden can be coached to only refer to his opponent, in all circumstance, in every reference, directly or indirectly as:
"Congressman" (not Congressman Ryan, or Mr Ryan or Representative Ryan ... just Congressman)
Obviously the trappings of Govenor do not apply, nor Senator ... but for 90 minutes or so (fair or not), being called "Congressman" may be as challenging a thing as any:
http://www.realclearpolitics.com/epolls/other/congressional_job_approval-903.html#polls