Ideological Warriors and Constituent Servants: Understanding the Determinants of Participation on Health Care Legislation in the Polarized Senate

Recent scholarship on the Senate indicates that partisanship and polarization have fundamentally changed the dynamics and the nature of policy making in the institution. To understand how senators balance their roles as constituent servants and partisan warriors, we examine senators’ participation in floor amending on major health legislation over a 10-year period (2000–2010). Health care is central to the ideological divide over the nature of the welfare state and has a significant impact on constituents. Unlike previous studies, we develop a fuller picture of the factors that motivate senators to participate by analyzing both amendments filed to a bill and amendments considered on the floor. We find that minority party status and ideology, both the liberal-conservative dimension and ideological extremism, are important indicators of participation. Furthermore, senators elevate ideology in comparison to constituent need when an issue is a presidential priority. Finally, the influence of constituency factors varies by party. For Democrats, their ideological commitment to the social welfare state makes them more likely to participate on health issues regardless of constituent need. However, Republican senators become more likely to sponsor amendments as the level of observable constituent factors increases.