Colorado Constitution of 1876 Art. XXVIII, § 15.

Because of a presumption of impropriety between contributions to any campaign and sole source government contracts, contract holders shall contractually agree, for the duration of the contract and for two years thereafter, to cease making, causing to be made, or inducing by any means, a contribution, directly or indirectly, on behalf of the contract holder or on behalf of his or her immediate family member and for the benefit of any political party or for the benefit of any candidate for any elected office of the state or any of its political subdivisions.