How does the relationship between the executive and legislature in parliamentary versus presidential systems affect party discipline among legislators?
Think about your answer, then reveal below.
Model answer: In parliamentary systems, legislators vote as disciplined blocs because defecting from the governing coalition can bring the government down — a legislator who votes against the prime minister's key legislation is effectively voting to end the government and potentially trigger elections, harming their own party. This survival incentive produces near-perfect party-line voting. In presidential systems, the executive has an independent electoral mandate and a fixed term — it cannot be removed by a legislative confidence vote. This eliminates the survival pressure on legislators, allowing them to cross party lines based on constituency interests, personal beliefs, or coalition-building without threatening the executive's survival.
The practical consequence is that presidential systems can produce cross-party coalitions and ideologically mixed votes (historically common in the US Congress), while parliamentary systems produce tight party blocs. This also affects the role of the individual legislator: in parliamentary systems, the party leadership's position dominates; in presidential systems, individual members have more independent power. Understanding this difference helps predict legislative behavior across different system types.