... Counterfactuals¹

Available from http://GKing.Harvard.Edu/whatif.

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... Stoll²

Assistant Professor of Political Science, University of California, Santa Barbara (3713 Ellison Hall, University of California, Santa Barbara, CA 93106; http://www.polsci.ucsb.edu/faculty/hstoll/, hstoll@polsci.ucsb.edu).

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... King³

David Florence Professor of Government, Harvard University (Institute for Quantitative Social Science, 34 Kirkland Street, Harvard University, Cambridge MA 02138; http://GKing.Harvard.Edu, King@Harvard.Edu, (617) 495-2027).

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... Zeng⁴

Professor of Political Science, University of California-San Diego (Department of Political Science, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0521, zeng@ucsd.edu).

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