Do Democrats have greater difficulty maintaining party unity than Republicans? William Mayer argues that they do, chiefly because the Democrats are a more ideologically diverse, less cohesive party. After extensively documenting the Democrats' traditional problems of division and disagreement, Mayer presents evidence suggesting that the Republican advantage over the Democrats has finally started to narrow-raising important questions about the future of the Republican coalition.

William G. Mayer is assistant professor of political science at Northeastern University.

Why have the Democrats lost five of the last seven presidential elections, even though polls consistently show that more Americans identify with that party than with the Republican party? And why are Democratic presidential nomination races usually so much more bitter and fractious than those held by the Republicans?The answer, argues William Mayer, lies in an important but too often ignored feature of American politics: The Democrats are a more ideologically diverse, less cohesive party than the Republicans and thus have greater difficulty maintaining party unity. After extensively documenting the Democrats' traditional problems of division and disagreement, Mayer presents evidence suggesting that in recent years the Republican advantage over the Democrats has finally started to narrow,raising important questions about the future of the Republican coalition.

Forthcoming Titles -- Foreword -- Introduction: Party Unity and Presidential Elections -- Do Democratic Rules Make the Nomination Process More Divisive? -- The Divisive Primary Revisited -- Ideological Cohesion in the American Party System -- Ideological Cohesion over Time: The Origin and Evolution of the Party Coalitions -- Group Appeals and the Democratic Coalition -- The Politics of Democratic Disunity -- Variables Used in the Probit Equations in Chapter 3 -- Measuring Ideological Cohesion -- Open-Ended Responses on Group-Related Themes and Issues