Should Christians be interested in tax policy?

Should Christians be interested in politics? Or tax policy? It is always interesting to see how the Christian scriptures are read through the eyes of other traditions. Jewish Scholar Leonard Fein writes:

Our tradition knows no radical distinction between politics and culture.  Ours is a profoundly political religion, not a pietistic faith.  We are enjoined to reject the world-as-it-is, to love it for what it may yet be, and to help transform it from the one into the other.  To be interested in a serious Jewish culture means, necessarily, to be interested in politics – in whether the hungry are fed and the naked clothed, in whether justice is pursued and mercy loved.  Judaism does not tell us which tax reform plan to favor; it does tell us that no tax plan that slights the downtrodden is acceptable.

- Leonard Fein in the Jewish Journal, Jan 2012