How did the supreme court ruling in citizens united v. fec affect campaign funding and spending? a. it leveled the field of campaign spending by expanding public funds to make them available for all elections, not just presidential elections. b. it restricted campaign spending by banning political parties and candidates from receiving or spending soft money on election campaigns. c. it weakened campaign finance laws by ruling that corporations and unions could not be prohibited from running ads, and that corporations could spend an unlimited amount on federal elections. d. it strengthened campaign finance laws by upholding the bipartisan campaign reform act's ban on corporations and unions running ads, in the weeks before an election, that mentioned individual candidates.