This ex post facto, causal-comparative research study examined student reading performance data within a school district before and after a school district-wide decision to alter the reading curriculum in response to local political pressure from parents. Data analysis revealed that test scores dropped to a significantly lower level, especially for students who were economically disadvantaged, after the reading curriculum was altered. This study underscores the importance of making data-driven, rather than politically-influenced, decisions related to pedagogy, curriculum, instruction, and assessment by educational leaders. (Contains 2 tables and 6 figures.)