The September Colorado voter registration numbers had Republican registration up by 1,513 on the month. The Republican-Democrat registration gap widened by 2,959 to now leave Republicans at a 63,094 registration disadvantage to Democrats.
The electoral mix deteriorated by more than expected likely as a result of a 130,000 piece voter registration mailing that was sent out by the left-leaning Voter Participation Center. There is still no evidence in the numbers of any concerted effort by Republican organizations.