Which Senate position is mentioned in the Constitution but currently wields little real power, so it is often held by the most senior member of the majority party?

Question

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The position mentioned in the Constitution but currently wielding little real power, often held by the most senior member of the majority party is the president pro tempore. This position serves as a presiding officer of the Senate in the absence of the vice president and is mainly a ceremonial role.

Which Senate Position Is Mentioned in the Constitution but Currently