Republican presidential candidate Herman Cain is enjoying more exposure than ever this week, so it was curious to see one of his campaign workers put out a new TV commercial that shows him casually smoking a cigarette and being just plain weird. Not as weird? Seeing Tim Heidecker make his own ad and jingle for “Hermun” Cain — ride the Cain Train! Wait a second. Isn’t VP Joe Biden the train candidate, though?