This article extends the study of the shortcomings of the constitution-making design that contributed to the failure of the Chilean process by addressing a largely overlooked aspect: the 2020 entry referendum. By placing two competing constitution-making models on the ballot, the political elites delegated to the voters a highly conflictual aspect of the process design that prevented cooperation among them. While some political parties approached the disagreements placed on the ballot as an opportunity to reopen discussions already settled by the 2019 Agreement, others interpreted the move as a cancellation of the political insurance contained in the Agreement. This exacerbated the existing polarization among political elites and imperiled prospects for the success of the process.