The purpose of this article is to propose a model to explain the simultaneity of campaign contributions and voting. Three U.S. House of Representative votes on sugar amendments are studied. The empirical results suggest that we cannot reject the hypothesis of the simultaneity between campaign contributions from the sweetener producer and user political action committees and House voting on the sugar amendments. The hypothesis that the House Agriculture Committee members receive more money from the sweetener producer and user groups is rejected while the results find that junior members receive more contributions from both groups. This suggests a long-term investment behavior of the two interest groups. The results also show evidence of vote-trading among sugar, tobacco, and peanut farmers. The simulation suggests that the sugar program would remain in place if campaign contributions were not allowed.