On paper, this is a great test, because it can cause a liberal to doubt themselves as being such by the sheer fact that no one is going to answer any of those questions in a strictly partisan manner. If they do, like Mull says, they stray from the party and that can bring doubt to the average non-thinking liberal who is fooled by this test in general. In short, this is a great tool to cause little cracks here and there in the opposition's platform.
But I have to agree with Thom. First, one has to define what a liberal is - and mostly to themselves. There are many forms of liberals; conservative liberals even, just as we are now seeing there are liberal conservatives who are against the war in Iraq.
With that, taken with an open (and wary) mind, the questions are biased and full of conjecture - one has to read into them to see the trap. That's what makes it a good test - not of party loyalty - but of party resolve.
