JON CALDARA: Colorado’s policy laboratory now staffed by mad scientists.

For decades, Colorado has served as the nation’s favorite guinea pig — a testing ground for policies so bold, so idealistic and so occasionally boneheaded other states quietly thanked us for jumping in the pool first.

What Silicon Valley is for apps, Colorado is for policy experiments. Sadly, when our “beta test” crashes, there’s no “uninstall” button — just another special session.

Colorado was one of the first states to repeal the counterproductive progressive income tax and replace it with a fair, flat tax. This resulted in the current competition between states to get the lowest flat tax. Thus, the population and business exodus from California and New York to Texas and Florida.

We were the first to constitutionally cap government growth with our Taxpayer’s Bill of Rights, or TABOR.

This double-barreled blast of flat tax and expenditure limitation lit Colorado’s economic engine into overdrive for three decades now. So, like trying to bring back polio, there are now efforts to bring back a progressive tax code and repeal TABOR. Of course, bringing back polio would be less damaging.

What’s the vaccine against progressivism? History, evidence, nor logic seem to do much good.