Voters replaced Democratic senators with Republicans in Arkansas, Colorado, Iowa, North Carolina, Montana, South Dakota, West Virginia, and likely in Alaska, and appear on track to do so in a runoff next month in Louisiana. At the same time, voters kept Republicans in GOP seats in heavily contested races in Georgia, Kansas, and Kentucky. That is at least ten, and as many as a dozen, tough races, without a single Republican seat changing hands. Tuesday's voting was a wave alright - a very anti-Democratic wave.