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I reject most of the metaphysical assumptions of the liberal intellectual tradition. Ideologically, I identify as a communitarian, but I think 'progressive' works well enough since it captures the broad political coalition that I'm a part of without implying many further beliefs beyond the particular policies I support in the context of American politics.
I mean, if you want to call yourself a liberal, that's fine by me, but there's more to the progressive coalition than liberals.