That Hauser's Law (I had forgotten the name) applies during deep recessions has one especially relevant point going into the 2012 election: in a recession the economy shrinks, and because the government's revenue is still a function of that economy and per the Law cannot consume more than ~18% of it, it follows that the government must likewise shrink. Instead, we're doing the exact opposite. That point should be understandable by all but the most fervent socialists.
Hauser's "law" is really more of a statisitcal oddity...one that is consistent enough the CBO uses it to estimate revenues. However if conditions change in the right way, we could see different results. ( say a law similar to that proposed in the U.K. where the government gets your paycheck first, and then decides how much you keep, or a National Property tax) The hypothesis for the underlying cause of the rule is that people are free to choose, so they choose to hide/shelter money, and or to "go Galt" and not make or invest it. The most ardent Socialist is all for taking choice away from citizens, so the law is irrelevant to them- the answer is just being more brutal and heavy handed in collections.
So sadly it doesn't really eliminate the political aspects- but it does force the Socialist into the light as an advocate of despotic government authority, allowing them to be attacked on those grounds. Likewise the ideological arguments of the right are still valid in an envrionment where the basic tax structure stays the same. If we always get ~18% of GDP, then the only way to get more revenue is to grow GDP in real terms. In a world where government spending is becoming an ever bigger component of GDP ( I was kinda surpised Hauser still holds in that environment) growth is provided by borrowing. Even in the short term this will no longer be an option -- we need to get the private secotr GDP growth moving - which means lowering taxes and regulation thus providing more choices and possibilities.
Ultimately every "argument" with the left is one over is the Sowellian question "who is to decide?"
Of course its not really an argument because all the left says is "I will" and then tells you to talk to the hand. They aren't interested in discussing the point.