The South Dakota presidential primary is scheduled for June 2, 2020, considered by many to be “too late” to make any sort of difference. So one would-be race organizer, based in Rapid City, has come up with a unique way to draw more attention to their state’s primary: an age-graded, gender-graded 5k to be run by all the candidates still on the ballot. The group, aptly named the Presidential Run 5k, faces many challenges, including…