I usually go after visiting the "other" booth first; I like to go up and start BS'n with em and then plaster stickers from the winning team all over the front of their booth. Two years in a row and I haven't been caught, the liberatarians in their corner booth were laughing their asses off and almost gave me away though last year.

It helps to have a distraction, a helpfull wife or brother to get the other one talking and not paying attention is the ticket.