At the heart of the recent events in Tennessee lies the problems when a group in a legislature becomes large enough to be a supermajority, meaning that they cannot be checked by any other forces within the legislature.
For an upcoming discussion:
- Wikipedia: Supermajority.
- The Case for Supermajority Rules.
- The Problems with a Supermajority.
- Supermajority Votes in the House.
- Do Supermajority Rules Limit or Enhance Majority Tyranny? Evidence from the US States, 1960-1997.