Have you not been paying attention to Europe that tried austerity to get outta this mess and are worse off than the US and bringing down the global market.
Perhaps you might be aware that the US is not Europe, and that "austerity" (what a stupid name for a simple concept, bringing spending in line with available money) is the right long term answer. Long term answer doesn't mean painless. Chemo makes you feel very very sick, but in the long term it could keep you alive.
every single piece of evidence that shows that the liberal approach works and the conservative approach fails (which would be the only kind of evidence that exists)?
Actually, the "liberal approach" (spend spend spend and spend some more!) is what got us into this mess to begin with. Note that republicans engaged in the "liberal approach" as well. You don't get $15 trillion in the hole by living within your means.