FILE - In this Sept. 3, 2016 file photo, Libertarian presidential candidate Gary Johnson speaks during a campaign rally at Grand View University in Des Moines, Iowa. First it was Bernie Sanders. Now it's Gary Johnson and Green Party presidential nominee Jill Stein being sized up by many young people. With barely a month to go, Hillary Clinton is still struggling to convince young voters who twice helped elect Barack Obama that she deserves their support. Scott Morgan AP