Scroll through or search the table to see the money spent by outside groups in three heated San Diego County races: 49th Congressional District, district attorney and 4th District Board of Supervisors, from Jan. 1, 2017, to June 1, 2018.

Source: San Diego County Registrar of Voters Office

Data by Jill Castellano and Leonardo CastaƱeda, Graphic by Brandon Quester | inewsource.org