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[1] The definitive version of this article is available at http://onlinelibrary.wiley.com/doi/10.1111/papa.2006.34.issue-2/issuetoc.

[2] This is an electronic version of an article published in Philosophy & Public Affairs. Complete citation information for the final version of the paper, as published in the print edition of Philosophy & Public Affairs, is available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1088-4963.