Campaign Spending with Office-Seeking Politicians, Rational Voters, and Multiple Lobbies

I introduce a microfounded model of campaign finance with office-seeking politicians, a continuum of voters, and a large number of heterogeneous lobbies. Lobbies make contributions to politicians according to a common agency framework. Politicians use contributions to finance their electoral expenditures. Voters are not fooled by electoral expenditures: they are influenced in a way that is consistent with the equilibrium behavior of lobbies and politicians. The model is used to: (i) determine the relation between campaign spending and the deviation from the median voter's preferred policy; (ii) show the informational value of lobbies' contributions; (iii) evaluate the welfare implications of restricting campaign spending; and (iv) interpret the empirical finding that campaign expenditures have a very low effect on election outcome. Although in equilibrium advertising provides voters with useful information, under reasonable parameter values, a ban on campaign contributions makes the median voter better off. Journal of Economic Literature Classification Numbers: D72, D82, M37.