Harris and Walz to campaign by bus in Pa. before the DNC in Chicago

Vice President Kamala Harris, presiding over proceedings as the role of the office, read the tally.

The highlight of this year's calendar is on Nov. 4, when elections are held for Virginia governor, New Jersey governor and New York mayor.

The outgoing U.S. senator said he had been “blessed” by the opportunity to perform public service and highlighted what he recounted as key successes throughout his career.