The rise of partisanship in Congress has been one of the most conspicuous features of American politics during the 1990s. David Rohde's (1991) Parties and Leaders in the PostReform House demonstrated that much of this rise in partisanship could be attributed to the convergence in congressional voting between Northern and Southern Democrats. Since the New Deal, the latter had traditionally allied with Republicans on many issues in a bipartisan conservative coalition that generally dominated both Houses of Congress and constrained liberal legislative outcomes. While Rohde and Barbara Sinclair (Legislators, Leaders and Lawmaking, 1995) have emphasized how institutional rule changes in the 1970s created a much greater incentive for party loyalty among member of Congress, relatively little attention has been paid to the extent to which enhanced partisanship in Congress has been driven by “bottom-up” electoral imperatives. Stanley Berard's new book on Southern Democrats in the House convincingly shows that major changes in the southern electoral environment were equally important in promoting convergence in the voting records of Northern and Southern Democrats, leading to a more partisan House overall.