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This study simulates the application of single transferable voting (STV) in the Colorado House of Representatives by generating 10,000 multi-member districting plans and creating ranked ballots based on the 2022 attorney general race results. The findings reveal that STV significantly enhances proportional representation for both Democrats and Republicans compared to the existing first-past-the-post electoral system. This research highlights the potential for STV to improve legislative representation and suggests further exploration into its effects on minority group representation in Colorado.
STV could transform Colorado's political landscape, offering a more equitable representation for major parties compared to the current voting system.
Social choice theory research demonstrates that single transferable voting (STV) results in more proportionally representative legislative bodies. We aim to understand how using multi-member districts and ranked ballots with STV would affect the representation of political parties in the Colorado House of Representatives. We investigated this objective by producing 10,000 multi-member districting plans of Colorado, generating ranked ballots for each of these plans using returns from the 2022 Colorado attorney general race, and simulating STV using these ballots. Our simulated STV elections for the Colorado House of Representatives gave more proportional representation for Democrats and Republicans than the current first-past-the-post system. Future research should explore how the implementation of STV would influence the representation of racial and language minority groups in the Colorado General Assembly to provide guidance on electoral reform in the state.