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The mind is material in the sense that it is directly a function of the brain and cannot exist beyond the confines of the brain. Want proof? Start cutting chunks out of someone's brain and their mind will change drastically. Even just changing the chemical composition of the brain with drugs (legal and illegal) will observably effect the mind of the user. If you were going to argue for an immaterial mind, you would have to explain why its composition can change drastically with just the slightest alteration to the structure of the brain.
If there is an immaterial aspect to the mind though, as tylerc pointed out, it can probably be argued through the paradigm of Cartesian dualism and his bifurcation of the body and mind. While there aren't many strict Cartesian philosophers left these days (most of his ideas have been transcended by more complex, more recent philosophies) the idea that our subjective experience - that is, what we experience in our "mind" - is somehow different and seperate from the "external" world is a re-emerging theme in philosophies all over the world. So, that is, although the mind can be quantified satisfactorily via a perspective of materialistic reductivism, it could still be argued that our subjective experience of consciousness transcends reductivist theory, as the thoughts, ideas and memories that comprise our "mind" can not easily be quantified, or empirically observed even though they unquestionably reside in the brain. In other words, even though we may understand how memories and ideas are stored, created and retreived in the brain, the neural structures we can point to and say "this is where the mind is" do not adequately describe what we directly, subjectively experience. Therefore, even though the mind is technically reducible to materialistic functions, our own subjective experience of the mind and of consciousness transcends materialistic explanations and thus, it could be argued, our mind is in a very real sense "immaterial".
Hope that helps. And yeah, you'd probably get more responses if you moved this to the political forum.
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