George Ticknor Curtis, History of the Origin, Formation…
“ It has been found that to require the electors to designate the persons for whom they vote as the President and Vice-President, respectively, has a tendency to secure a choice by the electoral votes, and therefore to prevent the election from being thrown into the House of Representatives; and it has also been deemed expedient, when the election has devolved on the House of Representatives, to confine the choice of the States to the three highest candidates on the list returned by the electors. ”
