By Nandita Bose and James OliphantNEW YORK (Reuters) -Democratic presidential candidate Kamala Harris appeared on the “Saturday Night Live” TV comedy show on Saturday, adding a surprise jolt to the U.S. presidential election just three days before her showdown with Republican Donald Trump. Harris was making her first appearance on the show, which has had other presidential candidates over its decades-long run. Trump appeared on SNL during his first presidential bid in 2015, where he poked fun at his tendency to exaggerate and steer clear of policy specifics. Only seven states are seen as truly competitive, but a poll released on Saturday showed Harris holding a surprise lead in Iowa, a state Trump won easily in the last two elections. Campaigning in Atlanta, Harris said Trump would abuse his power if he returns to the White House.