The paper is a preliminary exploration of the problems posed by low levels of voting error in the recovery of interval level parameter estimates in spatial (geometric) models of parliamentary voting. Our results, though limited, show strong support for the Quinn Conjecture, namely, if the voting space is one dimensional and the noise process is symmetric, then as the number of roll calls goes to infinity the true rank ordering of the legislators will be recovered.

We also discuss the "sag" problem -- errorless voting by a legislator at the end of the dimension -- and how it relates to estimating ideal point configurations for the United States Supreme Court.