The U.S. Senate presented the most powerful obstacle to any progressive reform. Because senators at the time were elected by state legislatures rather than by popular vote, the majority of senators owed their positions to their state machines. These organizations, William Allen White observed, were in thrall to the business interests that filled their coffers through campaign contributions or blatant bribery. In a number of states, the bosses made themselves senators; in others, wealthy individuals purchased their seats