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What is the Popular Sovereignty (Consent of the Governed) and why is it important to our political system?
Ideally, our government exists to serve its people. Popular Sovereignty states that the people 'rule' themselves. Based on this principle, our government exists to serve the people and should always aim to do so.
This is why people are the deciding factor in who represents them in government, and those representatives are supposed to reflect the wants and needs of the people who elected them, and vote according to this. Otherwise, they are likely not re-elected. Also, if there is no formal law in place for the overall safety OF the people, then people are free to do as they choose.
On the opposite end, like in a Monarchy, the people exist to serve its government.