Do Campaign Contributions from Farmers Influence Agricultural Policy? Evidence from a 2008 Farm Bill Amendment Vote to Curtail Cotton Subsidies

This article studies the political activities of individual cotton farmers and cotton political action committees (PACs) by exploiting a vote to amend the 2008 Farm Bill. Using a simultaneous model, I estimate reduced form equations for donations from cotton farmers and cotton PACs using tobit models, which instrument donations in the probit vote equation to control for the hypothesized endogeneity between campaign contributions and legislative votes. I find evidence that cotton farmers, like cotton PACs, contribute to legislators representing a median cotton farming constituency. I find no evidence that contributions from cotton farmers or cotton PACs significantly affected the vote decision.