
In 2025, campaigns supporting and opposing 30 statewide ballot measures in nine states received $183.15 million in contributions. The ballot measure receiving the most contributions was California Proposition 50, which authorized the state to use a new congressional district map. Campaigns supporting and opposing Proposition 50 received $172.7 million in contributions, with $124.9 million to…

California Proposition 50 ranks as the seventh most expensive ballot measure, based on total contributions to campaigns supporting and opposing the constitutional amendment. As of Oct. 13, about $139.9 million had been raised for and against Proposition 50. Supporters received $97.7 million, while opponents received $42.2 million. To become the sixth most expensive, surpassing Proposition…