A CNN / AP poll finds Republican Cory Gardner is leading Democratic Sen. Mark Udall , 50 - 46 . Gardner 's campaign is based on huge advantages in Denver 's suburbs and Colorado 's rural areas . Gardner is one of a handful of Democratic incumbents that Republicans have targeted this year .
A CNN/ORC poll finds Republican Cory Gardner is leading Democratic Sen. Mark Udall , 50-46 . Gardner 's lead is built on huge advantages in Denver 's suburbs and Colorado 's rural areas . Udall is one of a handful of Democratic incumbents that Republicans have targeted this year .