I'll see if I can dig it up, but I remember reading that on average, under democratic presidencies going back to FDR, the economy in general performs better than it does under a republican presidency. If I'm remembering right, it's not as simple as mere ideological differences because there has been changes within the parties in those intervening ~75 years but the trend still holds.

Found your article for you, as I was looking it up the other day:

https://en.wikipedia.org/wiki/U.S._economic_performance_by_p...