Prop. 50: The campaign over Newsom’s maps is one of California’s most expensive ever

For the record: This story was updated on Oct. 10 at 11:30 a.m. An earlier version of this article contained a number of erroneous characterizations and conclusions based on an incorrect interpretation of campaign finance data. The article has been corrected to reflect that Prop. 50 is not the third most expensive campaign in state history. The article has also been updated to reflect that MoveOn.org is not among the top five donors to support the measure, but the California Nurses Association is. An incorrect reference to the amount of small-dollar donations by the House Majority PAC has been removed. The story has also been updated with new contribution data that changes the list of top opposition donors, which now includes Ohio Republican Congressman Jim Jordan. Other totals have been adjusted accordingly. Read a detailed methodology of CalMatters’ data analysis.

THE FIGHT OVER changing congressional districts in California to favor Democrats has already become one of the most expensive ballot measures in recent state history.