On the contrary, it is a liberal argument that tax rates impact the economy just as much as a conservative one. I have endlessly heard how tax rates were higher under the Clinton regime, and the economy was better, so we should therefore return to the tax rates of those years. It is not conservatives who are putting out this argument, it is people on the left. The assumption is that higher tax rates somehow magically produce a better economy. No real economist believes this. There were other conditions going on back then that simply do not exist today--from international competition to changes in the workforce and population.