The clerks sent a four-page letter of complaint Monday to Colorado's top elections officer, Republican Secretary of State Scott Gessler.

Among the fears expressed by the Colorado County Clerks Association was a complaint about new mobile registration applications.

The clerks say those apps weren't properly tested and required emergency rules. The clerks also took issue with a new policy for overseas voters.

The clerks said that a print-your-own-ballot system for overseas voters was also improperly tested and has led to problems. The clerks requested an in-person meeting with Gessler.