(Courtesy: Rural America 2020 via Storyful) DES MOINES, Iowa - As President Donald Trump's fans head to his campaign stop in Des Moines, Iowa on Wednesday afternoon, they'll pass a large billboard that criticizes the president's handling of the coronavirus pandemic, calling the rally a "superspreader event."The billboard is across from the Des Moines International Airport, where the president's rally is scheduled to be held at 6 p.m.