A major party gone mad?
There was never any evidence to support strong supply-side claims about the marvels of tax cuts and the horrors of tax increases; even freshwater macroeconomists, despite their willingness to believe foolish things, never went down that road.
Since the 1970s there have been four big changes in the effective tax rate on the top 1 percent: the Reagan cut, the Clinton hike, the Bush cut, and the Obama hike. they predicted dire effects from the Clinton hike; instead we had a boom that eclipsed Reagan’s.