I hope to clear up the issue...
Per Article XIX of the Colorado Constitution an amendment to the Constitution of Colorado (TABOR is an amendment to Article X) is initiated in the State House or Senate, has to pass by a two-thirds majority in the House, then the Senate, then it goes to vote of the people. Therefore, TABOR was voted on by the Colorado House, Senate, and people.
The reference Fenster makes to the U.S. Constitution concerns his assertion that TABOR somehow takes away Colorado’s republican form of government (which is the requirement in the US Constitution). For his claim to be valid one must assume that the fundamental functions of a government are taxing and spending (as Fenster claims). But this is simply not true - their function is to represent the people. If they want to raise taxes they decide within the Senate and House to do so, then send it to the voters as a referendum. There is no violation of the republican form of gov’t.
Yes, clearly not. Thank you for your work on this. I'm afraid I know more about national politics than CO politics. That should probably be the other way around.