Can we get a definition of what it means to be a liberal, conservative, libertarian, and moderate?
		
		
	 
How far down the rabbit hole do you want to go?
A classical liberal is a political stance that yearns for freedom and liberty of the individual in the face of governmental power.  Americans were for much of our history classical liberals.  We still live within that frame though we call it many different things and over the past say 75 years we've slowely allowed, sometimes warranted many times not, the power of the government to grow in the face of those freedoms for security purposes.
An American liberal, in general, is a creature whose base political thought comes out of and in support of the governmental reforms of FDR and LBJ and the increased "rights" movements that the country has seen.  This however, again, is changing because the "rights" movements are winning, for lack of a better phrase, and many or slowly being absorbed across the spectrum.  There are very few people that actually really beleive that blacks don't deserve the right to vote for example.
Classical conservatism was again, in generalities, a traditionalist theory that held itself in support of classical and time honored traditions that were first truly attacked after the American Revolution and French Revolution.  Like classic liberalism, it also stands for freedom and liberty, but it added the traditionalist beliefs in societal function.  It changed after these revolutions for the most part though.
American conservatism is almost not a real thing.  It's changed so much and classified itself so many different ways that it's hard to pin down.  The GOP took the phrase over in the face of the democrats running Congress for what ended up being 40 years, but even then it wasn't pure (though none of these are).  I don't even know what a conservative is now.  The GOP certainly isn't if it ever really was.  The sound bite clips of smaller government, less taxes, more defense, and on and on are both right and wrong.  I would say, if you want to have a theory argument, that conservatism is always in flux because of its nature.  Anything that clings to tradition moves slow.  But America, while clinging to its libertarist history, also moves forward rapidly for the most part.  What used to take empires hundreds of years to change we can do it in the span of a few years at this point.  We aren't perfect, but the nature of our polity makes pure conservatism tough to maintain.
Libertarians are easy to define - at the end, they believe in true self freedom and liberty and would stand against the power of the government to tell you how to use or abuse your body in any manner so long as your actions do not affect any other freed person.  In a nation state of over 300 million people in a world of 7 billion the theory is nice but almost impossible in practice.
Moderates are ***holes.  They think they are better than everyone else and think that by saying they are moderate they sound smarter then people who are actually willing to take a stand on something.  I hate moderates.  And frankly, I think deep down in places they don't talk about at parties, they hate themsevles too.
So for me, I don't fit anywhere.  Libertarianism works in theory.  But we need a foreign policy that is, frankly, interventionist.  We can't afford not to be.  So you can't claim to be a libertarian and then use the power of the United States military the way it needs to be used sometimes.  I am a classical liberal and a classical conservative.  Depending on the policy I am an American liberal and an American Conservative.  We have people that will say they are economic conservatives but social liberals and I guess that can work, but not always because if you take social liberalism in America far enough in practice, it's hard not to increase the tax base somehow to make it work.  At least with what we have now.
Maybe the easiest way to define the 4 for the purposes of a poll that has no subparts is this:
Liberal - government can and should be used as an agent of change for good.
Conservative - government can't be an agent of change for good but it should be used in a manner that doesn't go as far as the liberal would go.
Libertarian - government can't and shouldn't be used as an agent of change at all and should just get out of the way.
Moderate - use the government when you have to, don't use it when you don't have to, but whatever you do don't make me actually have an adult position on something.
ETA: and before you get the pitchforks.... I'm only half kidding about moderates.  I just needed something more humor than history.