Former president George H.W. Bush (not to be confused with current president George W. Bush) on Wednesday followed his son to Tennessee by a day and talked up Republican gubernatorial candidate Van Hilleary. 41, as he calls himself (to distinguish himself from 43 ) achieved an unwanted notoriety during his unsuccessful 92 reelection campaign when he proved unfamiliar with that common grocery-store device known as a scanner. Addressing a Memphis audience at the Plaza Club Wednesday, Bush Sr. picked up where he left off back then, talking about watching television and using that device to change the channels, the -- what do you call it? -- the push-button!