Mike Gravel has often been charaterized as a "Left-Libertarian". However, that characterization begs the question, "What is a Left-Libertarian?"
I recently came across a paper that tries to answer that question. Now this may or may not entirely represent the Senator's own political, economic, and social philosophy. Nevertheless, it may provide for some fruitful discussion.
Perhaps this paper can generate some fruitful discussion on the philosophy of libertarianism.
And perhaps the Senator would even be interested in responding to the paper in one of his future blogs...