Will Barack Obama be back on Saturday Night Live ? Perhaps so far the show isn't saying, but that's the word on the street and I've heard it too saying that, yes, an Obama appearance is in the offing, planned for November 1st the last SNL before the election. The presidential frontrunner was on the show once before almost a year ago, on November 3, 2007, on the last SNL before the writer's strike (and the last show before it got majorly buzzy). Since then, the show has boasted presidential-