In an excellent piece by Aaron Gardner from Redstate (posted in September 2012), statistics in some Colorado counties are brought to light. The facts are worthy of further investigation!
All ten counties investigated by Media Trackers reported voter turnout greater than the national average. Nine out of ten also showed voter turnout well above the Colorado average. Mineral and San Juan counties, which have voter registration numbers of 126 percent and 112 percent respectively, had voter turnout of 96 and 83 percent respectively.
Rounding out the ten counties looked at by Media Trackers are San Miguel county, which topped the list at 140 percent of the population being registered to vote and 52 percent voter turnout, and Ouray county, which had 119 percent of the population registered to vote and a whopping 74 percent voter turnout.
There are multiple reasons why voter registration rolls can linger above 100% It is difficult to establish a singular percentage for acceptable voter registration rates because it varies from one community to another. When I investigated this earlier this year, election clerks reported 80% - 85% is normal in cities, 90% + is normal in rural jurisdictions. All said, it varies depending on a variety of factors.
Sometimes voter registration bloat is a problem related to regulation (federal regulations make it difficult to remove inactive voters). Sometimes local demographics or budget issues are the cause. Issues related to data access and data integration also delays how election authorities are alerted to ineligible voters.
The problem in Colorado is that, not only is the registration rolls over 100%, but the percentage of voters is unusually high. This combination clearly indicates election irregularity. The actual percentage of voters should be lower than other election jurisdictions because fewer are actually residents and eligible to vote.
How did Colorado do in the November elections? I understand some Colorado voters are researching this now. This is a process that takes some time and also one that has a short timeline before the vote is certified.