The Democrats kept the governorship. They took the state Senate. And they defeated “bulletproof” U.S. Rep. Mike Coffman, R-Aurora. But the biggest sign that a “blue wave” swept Colorado in Tuesday’s election can be found in Adams and Arapahoe counties, where two incumbent Republican sheriffs were unseated by a pair of cops working in the tiny Denver suburb of Mountain View who ran as Democrats. The upsets, which occurred in the kinds of races that aren’t typically decided on party lines, saw Rick Reigenborn, a part-time detective, unseat Adams County Sheriff Mike McIntosh and Tyler Brown, a police officer, beat Arapahoe County Sheriff David Walcher. It was a “national avalanche of Democrats,” said Joe Webb, chairman of the Jefferson County Republican Party. “There were a lot of races that I thought we would not lose, that we did,” he said, pointing to the sheriff’s race in Arapahoe County.