IOWA CITY — She’s a former first lady, U.S. senator, secretary of state and now a formidable candidate for president.But Hillary Clinton’s visit to the Iowa City Public Library was news to many people hurrying to work or simply taking a walk through the downtown Ped Mall Tuesday morning.“What are all these people doing?” Joe Daringer of Iowa City asked, pointing to a line of people waiting to get into the library nearly two hours before what the Clinton campaign described as a “organizing event,”“Here?” Daringer said when told the people — a couple of hundred strong at that point — were waiting to see the leading candidate for the 2016 Democratic nomination for president.