I'm correct.
When the framers met for the Constitutional Convention in Philadelphia in 1787, they aimed to unify the colonies with a government that gave fair representation to all states, no matter their size.
They were deciding whether slaves in Southern states should be considered property –to abscond population taxes — or people, so those states could have more representation in government.
Slaves were the economic heart and pulse of the country and the Northern states, even if they did not engage in slavery, benefited from their labor. So even though slaves were unable to vote, the Convention decided that slaves should be counted as three-fifths of a white person for the purposes of representation in Congress.
Considering options for electing the president, James Madison, now known as the "Father of the Constitution" and a slave-owner in Virginia, said the "right of suffrage was much more diffusive in the Northern than the Southern States; and the latter could have no influence in the election on the score of Negroes."
With that, Madison had proposed the prototype for the same Electoral College system the country uses today: instead of a direct vote, each state was to choose electors, roughly based off their population, but weighted by slaves.