Amusingly, part of the problem is something that sounds like one of those Tea Party/libertarian inspired "let's stop the government getting a cent more than they should" ideas:
Down in comments, someone makes what I think might be a pretty good point:What's more, in an awkward (and perhaps embarrassing) twist, all that money could be lost. That’s because, under Colorado’s “Taxpayer Bill of Rights,” if in any given year the state reaps more tax money than revenue forecasters had projected, the state must return that extra revenue to taxpayers. This year, the provision will be triggered because—even though the pot money came in lower than expected—the state collected more tax revenue overall thanks to other industries such as energy and oil. Lawmakers are now crafting a bill that would ask voters this fall to approve an exemption to that provision for the pot tax.