The publication of Mayhewﾒs (1991) Divided We Govern created an explosion of research on the causes of legislative gridlock, but most of these explanations hold that divided government are the result of ideological differences within legislative institutions or between legislatures and the...

We know a great deal about how and why interest groups form, why individuals choose to give their time and resources to political organizations, but we know very little about why they stay in these organizations, if, in fact, they tend to. Are participation rates by members constant over time,...