What is the only official role of the vice president?

lead the national committee on the president’s party
organize presidential commissions
preside over the Senate***
vote in case of a tie in the Supreme Court

Yes, that's correct.

The only official role of the vice president is to preside over the Senate. If you are interested in understanding how to get the answer, you can consult the United States Constitution. Article 1, Section 3, Clause 4 of the U.S. Constitution states that the vice president of the United States shall be the President of the Senate. This means that the vice president is responsible for presiding over Senate sessions, maintaining order, and recognizing members who wish to speak. However, it is essential to note that the vice president can only vote in the Senate to break a tie. Other duties and responsibilities of the vice president, such as leading committees and organizing presidential commissions, are not specified in the Constitution but often assigned by the president.