Pre-print: Does Public Opinion Shape Elite Support for Defending Allies? Evidence from the British Parliament
In a newly published SSRN pre-print titled “Does Public Opinion Shape Elite Support for Defending Allies? Evidence on the Microfoundations of Collective Defense from the British Parliament”, Michal Smetana, Isabelle Haynes, Lauren Sukin, Ondřej Rosendorf and Marek Vranka analyzed how public and elite views on collecive defence diverge and how voter preferences influence the decision-making of their elected representatives.
Study design
The study utilized a paired pre-/post- intervention survey with members of the British Parliament (N = 100) and the British public (N = 1029), an elite survey of British parliamentarians with open-ended responses (N = 102), and in-depth semi-structured interviews with former and sitting British MPs (N = 13).
Key findings
British parliamentarians are more willing to defend NATO allies than the British public
Across all conventional policy options tested (economic sanctions, arms supply, cyber strikes, missile strikes, and sending troops) parliamentarians expressed significantly higher support for aiding Latvia, a member of NATO, in case of a Russian attack than did the British public. The sole exception was nuclear strikes, where elites were notably less supportive than the public, consistent with prior scholarship on nuclear weapon use.
Public opinion does shift elite preferences, but only modestly
Counter-attitudinal public cues, i.e. informing supportive parliamentarians that the British public largely opposed military involvement, and vice versa, produced a statistically significant shift in elite support for sending troops. However, the effect size was small to medium, indicating a real but substantively limited impact of voter preferences on elite decision-making in this domain.
Qualitative evidence reveals the latent and conditional nature of public influence
Open-ended survey responses from 102 parliamentarians showed substantial heterogeneity in self-reported responsiveness: roughly 30% identified public opinion as genuinely important to their defense decisions, 48% held an ambivalent position, and 21% explicitly rejected public opinion as a relevant factor, framing defense as a domain requiring independent elite judgment.
Semi-structured interviews with 13 sitting and former MPs further illuminated when public influence becomes consequential. Parliamentarians largely conceptualized their engagement with public sentiment as informal and impressionistic — gathered through constituency emails, doorstep conversations, and social media rather than systematic monitoring. They emphasized a preference for top-down opinion formation, viewing their role as shaping rather than following public attitudes on defense.
Nevertheless, they acknowledged that public pressure could constrain elite autonomy under specific conditions: prolonged troop deployments, rising casualties, intensifying economic costs, or the mobilization of concentrated and emotionally engaged constituency groups. Interviewees also distinguished between authentic grassroots sentiment and opinion they perceived as manipulated through disinformation, suggesting greater responsiveness to the former.
