Campaign finance has a profound impact on elections by influencing the resources available to candidates and political parties. Significant financial backing can lead to greater advertising reach, enhanced campaign infrastructure, and improved voter outreach efforts. However, reliance on large donations raises concerns about political corruption and the undue influence of wealthy individuals or organizations over policy decisions. The Citizens United ruling has further complicated the landscape by allowing unlimited spending by corporations and unions, which can skew electoral outcomes in favor of those with more financial resources, challenging the principle of fair competition.