There appears to be a bullet lodged in Tim Sheehy’s right forearm. That is not in dispute. But how and when it got there has become the subject of an ongoing mystery that has dogged the campaign of the former Navy SEAL challenging Sen. Jon Tester (D-Mont.) in one of this election cycle’s most high-stakes races. The question of how Sheehy was shot first came up last spring in a Washington Post exposé by Liz Goodwin who reported that Sheehy had said on the campaign trail he has a “bullet stuck” in his right arm from his time serving in Afghanistan.