The Filibuster Rule is a more modern iteration of the Founder's desire to limit the fickle power of the mob to influence the national government. Originally Senators, as well the President, were selected by State Legislatures; only the House was elected directly by the people. This protection was later lost when Senators became elected by popular vote, with their six year terms being the only remaining restraint on the swings of popular opinion. Modernly, the growth of out-of-state funding in Senate elections has further undermined this principle by nationalizing practically every Senate campaign. As a result the Senate's filibuster rule, effectively requiring a 60 vote majority for passing a controversial bill, acts as the final backstop against the vagaries of current public opinion.