The sociology of campaign finance overwhelmingly focuses on donation patterns and ties between donors, lobbyists, and candidates. However, less attention has been paid to ideological influences on campaign finance reform and other forms of expenditures. As a result, the sociological understanding of the role of money in democracy has great potential for development. This paper suggests that the new institutionalist perspective, particularly when treating ideas as a causal force, allows for a stronger understanding of campaign finance reform's impact on the public sphere. It does so by linking campaign finance law, political organizing, and campaign spending, specifically for the purpose of political advertising, together. The Citizens United v. FEC Supreme Court ruling provides an empirical example of these institutionalizing effects, tracking its impact across all three components of the public sphere. Approaches to new institutionalist analysis of campaign finance are also discussed.