Leaders of the TBD Colorado initiative, which stands for "To Be Determined," say in a report released Wednesday that the state's economic path is "unsustainable" without changes to the constitution.
The constitution limits tax increases but requires more spending for education.
The group met with residents in 60 statewide meetings to get their input.
Its findings are likely to frustrate Republicans who argued that the yearlong initiative sought to lay the groundwork for tax increases.
The group's recommendations are not binding.
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