You assume that government revenue must be maximized. I disagree. Government revenue must be minimized.
Yes, we have evidence. The economic expansion in the 80's and 90's occurred AFTER the taxes were lowered. The deficits occurred because defense spending went up too much.
Most of the responses on here are a bit troubling. This particular thread doesn't even understand what supply side economics is, and I recommend that anyone reading this stop here, put anyone that gave the wrong answer on ignore, and move on, b/c their lack of understanding for the theory implies they know nothing about trading. Most of the incorrect answers given show the poster know nothing about economics, let alone the nuances of supply side or demand driven modern macroeconomics. I would agree this is a political debate rather than something concerning trading.
Great, a wiki. It's not like I'm halfway through the CFA curriculum, but even then, the dumbed down version is far more complex than those pithy articles.