With three weeks to go until the Republican primary, Provo Mayor John Curtis has tightened his grip on the lead in the special election to replace former Rep. Jason Chaffetz. The latest Salt Lake Tribune-Hinckley Institute of Politics poll shows Curtis trouncing his competitors by a more than 2-to-1 margin. âWhen the voters go into the ballot box, you want them to be able to look at the names and recognize one of them,â said Jason Perry, the instituteâs director.