Widespread democratic malaise has called into question the identification of the meaning of democracy with the institutions currently in place. But times of crisis, as well as posing challenges to institutions, also present opportunities for a deepening of democracy. This book seeks to bridge the gap between social movement studies and democratic theory. Progressive social movements experiment with new ideas in their internal lives, prefiguring alternative forms of democratic politics, and spread these ideas within institutions. Not only do they transform democratic states that struggle for policy change, but they express a fundamental critique of conventional politics, thus addressing metapolitical issues and experimenting with participatory and deliberative ideas. The book addresses these innovations that aim to increase participation and deliberation to save democracy.