Section 43. The names of the candidates for presidential electors shall not be printed on the ballot, but in lieu thereof the surnames of the candidates of each party for president and vice president shall be printed thereon in one line under the designation ”Electors of president and vice president” and arranged in the alphabetical order of the surnames of the candidates for president, with the political designation of the party placed at the right of and in the same line with the surnames. A sufficient square in which each voter may designate by a cross (X) his choice for electors shall be left at the right of each political designation.