And Dems have much stronger economic performance as well.
Supply side theory causes brief bubbles followed by significant declines and increases in deficits.
Dems usually have to pick up the pieces of Republican failure. Republicans often receive healthy economies, then give tax breaks to the rich which create imbalances, which in turn are expressed in market volatility.
A new centrist-right party should ditch supply side models and return to what was called good housekeeping - which involves seeking to balance the deficit as a share of GDP through the economic cycle, in a slightly anti-cyclical model.