It shall be the duty of the executive of the State from which any Senator has been chosen to certify his election, under the seal of the State, to the President of the Senate of the United States.
Structure US Code
CHAPTER 1— ELECTION OF SENATORS AND REPRESENTATIVES
§ 1. Time for election of Senators
§ 1a. Election to be certified by governor
§ 1b. Countersignature of certificate of election
§ 2b. Number of Representatives from each State in 78th and subsequent Congresses
§ 2c. Number of Congressional Districts; number of Representatives from each District
§ 5. Nominations for Representatives at large