A Colorado group working to pass an amendment to raise the state's minimum wage to $12 has learned the hard way that it's important to practice what you preach.

The Washington Times’ Kelly Riddell uncovered a wage report filed with the Colorado Secretary of State’s office that revealed 24 workers who gathered signatures for the ballot initiative were paid less than $12 an hour.

The group, Colorado Families for a Fair Wage, raised most of its money from nonprofit "social welfare" groups and labor groups, according to the Colorado Springs Gazette. It hired the Washington, D.C.-based canvassing firm FieldWorks to collect signatures for the ballot initiative.

The wage report was obtained by a group called Keep Colorado Working, which is opposing the amendment.

“If the union-led campaign, funded by a million dollars of national labor union money, couldn’t afford to pay their own staff $12 an hour, how do they expect small and family-owned businesses in rural Colorado to afford to?” Tyler Sandberg, campaign manager for Keep Colorado Working, asked the Durango Herald. “Their one-size-fits-all measure apparently doesn’t even fit their own campaign budget.”

On Tuesday, FieldWorks submitted a new report that showed all of its workers were paid at least $12 an hour. According to the firm, the initial report contained “clerical errors.”

“Upon a re-review of the previous circulator report, we discovered that wages for some circulators were mis-reported on the report that we pulled from our payroll company,” FieldWorks wrote to the secretary of state’s office. “This is because we had multiple projects in Colorado, and when some staff moved between projects in the middle of a payroll period, their wages were incorrectly applied to one project or another.”

Opponents argued that the only other project FieldWorks was working on had suspended its efforts on July 19.