Republicans were, though, more likely to believe Russian disinformation claims than their Democratic counterparts, with 57.6% falling for at least one Russian disinformation claim, compared with just 17.9% of Democrats and 29.5% of people who didn’t identify with one particular party.
See the source I posted in the edit.
That article says it was created to prevent a populist president, and that it should’ve been scrapped after the 12th amendment but the 3/5 compromise incentivized the South to keep it.
The Federalist Papers talk about this a bit and slavery was not a concern.