Who served as the President of the Senate?

Joe Biden served as the President of the Senate due to his role as Vice President of the United States from 2009 to 2017. The Vice President automatically holds this position, which includes the duty of presiding over the Senate and casting tie-breaking votes. This role is significant because it allows the President of the Senate to influence the legislative process, especially in cases where the Senate is evenly divided on a vote.

The other individuals listed are prominent figures in Senate history, but they did not hold the formal title of President of the Senate. Daniel Inouye served as a long-term senator from Hawaii and held leadership roles within the Senate but was not the Vice President. Harry Reid was the Majority Leader of the Senate, playing a crucial role in managing the legislative agenda for the Democratic Party but did not serve as President of the Senate. Mitch McConnell, also a Senate Majority Leader, similarly led his party in the Senate but did not take on the role of President of the Senate as he served as a senator rather than as Vice President.