This weekend, presidential candidates will begin their descent on the Iowa StateFair, a campaign tradition that allows voters to get up close with candidates.A campaign trip to the fair involves a plethoraof rituals: Givinga speech and taking questions on a hay bale, going on some carnival rides, taking a picture in front of a giant cow made of butter, and, most importantly, eating a lot of fatty, greasy food.One of the Iowa State Fair's signature items is the pork-chop on a stick, which candidates have been indulging in for the past several election cycles along with corn dogs and ice cream.Eating fried food with Iowans is a necessary part of a campaign strategy that allowscandidates to appear folksy. As The Washington Post notes, candidates generally pack on weight during campaigns because it can be difficult orimpolite to turn down food when voters offer.Some candidates embrace the grease, while others need a little coaching.According to New York Times reporterAmy Chozick, Secretary of State John Kerry's then-press secretary, Robert Gibbs, freaked out when he saw Kerry slurping a smoothie instead of eating fried food during a trip to the fair in 2003."Somebody get a f------ corn dog in his handnow!" Gibbs said.But if the candidates this year are looking to impress Iowans with enthusiasm for unhealthy food, they'll have to beat out former Texas Gov. Rick Perry (R), who downed a corndog, hard-boiled egg-on-a-stick, and a massive pork-chop on-a-stick when he attended the fair in 2011.Here are some of the current and former presidential candidates and past candidates chowing downat the fair.Former Arkansas Gov. Mike Huckabee (R) and his wife snack on pork-chops on-a-stick at the Iowa State Fair in 2007. The pork chops are a famous state fair snack.Huckabee scopes out some pork on the grill at the Iowa State Fair on Thursday. Candidates often take some time manning the grill.Hillary Clinton mingles with voters at the Iowa State Fair in 2007, ice cream in hand.See the rest of the story at Business Insider NOW WATCH: Chilling predictions for what the world will look like in a decade Click here to read full news..