Colorado poll workers are now being trained on how to respond to a mass shooting at the voting booths. Election officials in Denver and Aurora have added the trainings to their roster of staff preparation this year, and other areas across the state and the country may follow. “This is something we pay a lot of attention to in Colorado, because of the terrible experiences that we’ve had,” Matt Crane, the county clerk who oversees elections in Arapahoe County, said. “We want to make sure we’re as prepared as possible.”