Numerous get-out-the-vote (GOTV) interventions are successful in raising voter turnout. However, these increases may not be evenly distributed across the electorate and could potentially increase the differences between voters and nonvoters. By analyzing individual level-data, we reassess previous GOTV experiments to determine which interventions mobilize under-represented citizens versus those who regularly turn out. We develop a generalized and exportable test which indicates whether a particular intervention reduces or exacerbates disparities in political participation and apply it to 24 previous experimental interventions. On average, current mobilization strategies significantly widen disparities in participation by mobilizing high-propensity individuals more than the under-represented, low-propensity citizens. The results hold troubling implications for the study and improvement of political inequality, but the methodological procedures laid out in this study may assist the development and testing of future strategies which reverse this pattern.