Orange County is ground zero for fundraising in California's most contested races

"A Los Angeles Times analysis of this year’s campaign finance filings found it is also where the cash is going to: About $15 million of the nearly $28.5 million raised this year for 13 key races went to candidates in just four Orange County districts: the 39th held by Rep. Ed Royce of Fullerton, the 45th held by Rep. Mimi Walters of Irvine, the 48th held by Rep. Dana Rohrabacher of Costa Mesa and the 49th held by Rep. Darrell Issa of Vista."

From the Los Angeles Times, 10/31/17