It helps create a stronger, more collectivist kind of environment, which is more successful, I believe, than individualist environments.
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The correct answer is the people (aka citizens). In the Declaration of Independence, it is clear that the people are the ones who have the most political power.
The excerpt that proves this is when it states that "That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed." This quote is essentially saying that governments are made by men and that the power that elected officials may gain is thanks to people voting for them.
Ultimately, the political power in the US lies in the hands of citizens.