Denver used a ranked-choice voting system from 1916 through 1952, and then under reform Mayor Quigg Newton, voters replaced it with the runoff system, guaranteeing a majority winner every time.

The Denver district attorney’s office has opened an investigation into the leak of voting system passwords that were posted to a Colorado state website in June before being taken down last month.

DENVER (AP) — The Denver district attorney's office has opened an investigation into the leak of voting system passwords that were posted on a state website.