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This Element explores the growing party divisions on the environment in the United States. It draws upon quantitative and qualitative data from several decades of national and state politics. The study contributes theory to the party position change literature, showing that interest groups change parties, but in turn are changed by them. In the 1970s the characteristics that predicted voters' attitudes on the environment also predicted legislators' votes. Yet as environmentalists and their opponents aligned with parties, officials had incentives to set their own views aside to represent new party constituencies. Influence flowed in both directions, however. Environmentalists were drawn to the Democrats as they confronted GOP-linked business lobbies. Environmentalists' resulting need to cooperate with other groups close to Democrats led them to change their positions. Although environmentalists were long unwelcoming to minorities, they embraced immigration reform, allied with unions on trade, and worked with civil rights lobbies and labor in battles over judicial nominations. The Element concludes with discussion of how the current party alignment on the environment might change.

A partisan divide over LGBT rights has emerged in the U.S. Yet unlike other issues on which the parties have traded places or polarized, most of the change on gay rights has occurred within one party, the Democrats. How did this unusual change occur? LGBT rights was originally a fringe cause, rejected by most politicians in both parties. As gay rights activists slowly became more prominent in the Democratic Party, many politicians adapted, abandoning earlier positions informed by their personal backgrounds and state or district constituencies. Meanwhile, incorporating the religious right led most Republicans to maintain the anti-LGBT rights stand that was once common to both parties, even as public opinion shifted. The result was a partisan divide in this issue area that had consequences for policy. The role of adaptation by incumbents in producing it—contrary to some prominent models—is evident in both Congressional co-sponsorship and roll-call data. The growing party divide is also evident in platforms. These findings contribute to a broader understanding of how party position change occurs.

As the race to succeed Barack Obama intensifies, David Karol takes a look at the defining issues of next year's US presidential election, the electoral process and the leading contenders.

How has representation changed over time in the United States? Has responsiveness to public opinion waxed or waned among elected officials? What are the causes of such trends as we observe? Scholars have pursued these crucial questions in different ways. Some explore earlier eras in search of the "electoral connection", i.e. the extent to which voters held office-holders accountable for their actions and the degree to which electoral concerns motivated politicians' behavior. Others explore the effects of institutional changes such as the move to direct election of senators or the "reapportionment revolution."