Senator Pepper first appeared in TalkRadar 83, during the game deals section, to promote his giveaway of EA downloadable content (DLC), perhaps because, as he stated, he "gets all the DLC." Presumably he does not have use for all of it. We may also infer that he was a physician before running for office, and a humble man, since he introduces himself as "Dr. Pepper" despite the more prestigious honorific to which he is entitled.
He has not returned to the show, perhaps because Brett called him "the dumbest [hornswoggling] joke," or perhaps because the hosts discussed rumors that he or his son, Pepper Jr., was caught by Mrs. Pepper doing something unseemly in the bath tub with the family dogs. It is not known how many dogs or what size and type of bathtub were involved.