I think the point is...
It would empower the State legislators and cause the special interests to focus on them more than the US Senate. This would obviouly disperse the special interests and make them less effective at influencing the US Senate, and therefore, the goings on in Washington, DC.
Most people don't know enough about the Constitution to understand that the current method of electing Senators isn't the one the Founding Fathers intended.
But then most people don't understand the difference between a Democracy and a Republic.
Scott