In a conference room tucked away in a downtown Denver office building, a small group of bureaucrats and high-powered lawyers is continuing to hash out a series of proposals that could radically reshape the way Colorado conducts its elections. Backed by centrist megadonor Kent Thiry, former CEO of Denver-based dialysis company DaVita, proponents have set out to abolish the party primary and caucus system for nominating candidates for statewide and legislative offices, replacing it with an open “all-candidate primary” and a four-candidate general election decided by ranked choice voting…