Colo. Const. art. VI, § 13

District attorneys - election - term - salary - qualifications. In each judicial district there shall be a district attorney elected by the electors thereof, whose term of office shall be four years. District attorneys shall receive such salaries and perform such duties as provided by law. No person shall be eligible to the office of district attorney who shall not, at the time of his election possess all the qualifications of district court judges as provided in this article. All district attorneys holding office on the effective date of this amendment shall continue in office for the remainder of the respective terms for which they were elected or appointed.