NDER WORKING PAPERS SERIES WHY ARE THERE SO MANY DIVIDED SENATE DELEGATIONS? Alberto Alesina Morris Fiorino Howard Rosenthal Working Paper No. 3663 NATIONAL DOREAD OF EOONOMIO RESEAROM 1050 Massachusetts Avenue Oamnriage, MA 02138 March 1991 Alesina and Rosenthal acknowledge financial support from NSF Grant SES0921441. This paper was written when Alesina was an Olin Fellow et the NREE and Rosenthal a Visiting Professor ar W.I.T. Alesina gratefully acknowledges financial support from the Olin and Sloan foundations. We thank Keith Krehbiel, John Londregan, Eeith Poole, Kenneth Shepsie, end participants in seminars at Hoover Institution, Oarnegie-Nellon and University of Rochester for very useful coimsents end Gerald Oohen for excellent research assistance Any opinions expressed are those of the onthors and not those of the National Dnreau of Economic Raaeasch.