DES MOINES, Iowa — Shelby Houlihan grew up in Sioux City admiring fellow Iowan and middle-distance star Jenny Simpson. Houlihan just might be poised to pass Simpson as America’s next great hope at 1,500 meters. The 25-year-old Houlihan stormed past Simpson, 31, to win the 1,500 on Saturday at the USATF national outdoor championships at Drake Stadium — Simpson’s hometown track. Houlihan took the lead from Simpson with 50 meters left to knock off the seven-time national champion in the event. Instead of going hard for the entire race, Simpson’s strategy was to find a more realistic pace in hopes of having enough energy left to make the final kick count. She didn’t, but the younger Houlihan sure did. Houlihan won in 4:05.48, almost a second better than Simpson, to notch her second victory over Simpson in a month.