This article reports on why states are quitting the Partnership for Assessment of Readiness for College and Careers (PARCC) and Smarter Balanced Assessment Consortium (SBAC). The two consortia sought to develop state-of-the-art assessments that focused on problem solving and the application of knowledge, and that moved away from former tests' reliance on multiple-choice questions and the testing of factual recall. The consortia-designed assessments, however, have not fared so well, because their implementation became intertwined with new, controversial teacher evaluations and school accountability measures. Much opposition rose regarding the aligned assessments, particularly among parents. The backlash was against the amount of testing students would undergo and a perception that it diminished instructional time and encouraged "teaching to the test." In many states, policymakers who initially supported Common Core sought to diffuse opposition to the standards by withdrawing from the consortia-designed assessments. These issues have resulted in the consortia's announcement of new flexibility for states, and the option of using the complete assessment or specific items to customize their own assessments. Whatever fate awaits the consortia, their work has resulted in new opportunities and imperatives for states to work together on assessment design and implementation. A significant number of states are now engaged in unprecedented collaboration around common standards and tests, with or without the consortia.