Technically, a senator isn't supposed to be a representative of the people, that's what your representative in the house is for. Senators are supposed to be a representative of the state government to the US legislature. However, with the passage of the 17th amendment in 1913 that changed the election of senators from the state legislatures to a popular vote of the people, senate candidates started pandering to the people (just like members of the house always did), rather than working on behalf of the state government. The passage of the 17th amendment was the beginning of the end for states rights, since senators began working directly for the people, and began ignoring their state governments who no longer held the power to elect them. This was also the beginning of the modern entitlement state, since both senators and members of the house now pander to the same people to get elected, making their promises (bribes) much more likely to be passed into law.
If there was one thing I could change in the federal government to try to "fix" things, it would be to repeal of the 17th amendment and return election of senators back to how the founders originally intended in the constitution. This would slowly return power back to the states, while at the same time bringing a voice of reason in national politics to say no to entitlements that the states can't afford.