The governor shall be elected by the qualified electors of the state at the time and place of choosing members of the legislature. The person having the highest number of votes for governor shall be declared elected, but if two or more shall have an equal and highest number of votes for governor, the two houses of the legislature at its next regular session shall forthwith, by joint ballot, choose one of such persons for said office. The returns of the election for governor shall be made in such manner as shall be prescribed by law.