Final answer:
The power exemplified by Congress in the quote is Congressional Oversight, which allows Congress to monitor and review federal agencies and departments.
Step-by-step explanation:
The power exemplified by Congress in the quote is Congressional Oversight. Congressional oversight is the review, monitoring, and supervision of federal agencies, programs, activities, and policy implementation. It is a critical aspect of the checks and balances system as it allows Congress to oversee the executive branch and ensure that laws are implemented correctly. The reference to the State Department's handling of the Benghazi incident is a direct example of congressional oversight in action, where the legislative body is examining the actions of an executive department to assess its performance and prevent future errors.