Colorado Secretary of State Scott Gessler, a Republican, told the panel that his department’s study identified nearly 12,000 people who were not citizens but were still registered to vote in Colorado.
Of those non-citizen registered voters, nearly 5,000 took part in the 2010 general election in which Democratic Sen. Michael Bennet narrowly defeated Republican John Buck.
Colorado conducted the study by comparing the state’s voter registration database with driver’s license records.
“We know we have a problem here. We don’t know the size of it,” Gessler said in testimony to Administration’s Elections subcommittee.
He told Harper that Colorado would look to create a registration system that would allow his department to ask that some people provide proof of their citizenship in writing.
If individuals did not respond to the request, their registration as voters would be suspended.
