Al Gore's upcoming appearance as host on this week's "Saturday Night Live" and his recent forays into talk-TV land are examples of a political strategy that dates back to the days of Teddy Roosevelt, says a University at Buffalo political science professor who studies presidential campaigns. "Of course," adds James E. Campbell, "over time there's been a big change from Teddy Roosevelt's aggressive, but dignified personal campaigning to Clinton's saxophone solos on Arsenio Hall's show and Gore's and John McCain's appearances in 'Saturday Night Live' comedy skits."