Campaign finance refers to the financial contributions that support candidates running for office in the United States. Understanding the regulations and implications of campaign finance is crucial for evaluating the political process. One significant ruling by the Supreme Court was in the case of Citizens United v. FEC, which has had a profound impact on political spending. This case allowed for unlimited spending by corporations and unions in support of political candidates. Given this context, which of the following statements best describes a primary outcome of the Citizens United v. FEC decision?