More than three-quarters of the $266 million given by the top 50 donors to ballot measure groups nationwide ahead of the 2014 elections came from corporations or business trade groups.
Business interests among the top 50 donors were almost always successful, winning 96 percent of the time.
Four out of every five dollars that the top contributing business groups gave to ballot measure fights went to the sides trying to defeat the proposals.
Totaling $88 million, health care groups gave more than any industry among the top 50 donors. Casino companies were a close second, giving nearly $60 million across the nation to 2014 ballot measure fights.
Five of the top 50 ballot measure contributors also gave big for elective office and were among the top 50 donors to races for state-level candidates: Wal-Mart Stores Inc., Sheldon Adelson, Michael Bloomberg, the California Democratic Party and the National Education Association teachers union.