Unless you knew to look for bib number 173, former Texas congressman Beto O’Rourke was easy to miss among the crowd of 141 runners this past weekend in North Liberty, Iowa, a suburb of Iowa City. O’Rourke donned a low-key look consisting of a white cap, shorts over black tights, and running shoes as he kicked off his Saturday with a St. Patrick’s-themed 5K while campaigning in the Hawkeye State. He finished in 24:29, good enough to place third in his age group (40-49). The 5K came just two days after another race announcement: On Thursday, O’Rourke posted a video...