Drawing on new data that combine recorded votes from the Swiss National Assembly with canton-level referendum results on identical legislative proposals, Portmann et al. (Public Choice 151:585-610, 2012) develop an innovative strategy to identify the effect of district magnitude on the relationship between representatives and their constituents. We replicate PSE's central result and also estimate a related model that allows for the possibility of non-monotonicity in the relationship between district magnitude and representatives' deviance from referendum median voters. Our results indicate that representatives elected in low-magnitude multi-member districts deviate from canton-level majorities less than either MPs from single-member districts or those from high-magnitude multi-member districts.Keywords Representation · Electoral systems · District magnitude · Switzerland 1 Portmann, Stadelmann, and Eichenberger's study and expectations about voter-legislator congruenceIn "District magnitude and representation of the majority's preferences: Evidence from popular and parliamentary votes," Portmann et al. (2012) (henceforth PSE) apply an ingenious research design to a novel set of data to estimate the effect of district magnitude (the number of legislators elected from a given district) on Swiss legislators' congruence with positions embraced by majorities of voters. The main empirical finding in the paper-that the more seats elected in a district, the greater the likelihood that a given MP will deviate in a legislative vote from the preferences of his or her district majority-raises important normativeThis comment refers to the article available at