The Difference Between Democrats and Republicans

Reader Spencer sends along this comment (slightly edited by me), more a reminder of how much I’ve forgotten as he’d brought this up in the past…

The democratic keynesian approach leads to greater investment while the republican supply side concept of giving tax breaks to the investor class has failed to generate greater investment.

What do you think? Is this a big part of the mechanism driving the difference we observe between the performance of Dems and Reps?