According to the following passage, how does campaign finance affect electoral fairness?

Within the struggle for political power, resources play a central role, and the financing of political campaigns can manifest deeper economic disparities. Money often sways political contests, favoring those with greater wealth and influence. This role of financial contributions is viewed as a reflection of the capitalist mode of production. It is argued that unrestricted campaign spending undermines electoral fairness by skewing the playing field, which helps maintain a system where power remains with the economically dominant.
—Adapted from an argument in Karl Marx, The Communist Manifesto, 1848