Cons: This is a system set up by the founding fathers, people would want to stick with the passed down, original tradition.
It also gives low-population states a say in federal government where higher population states might overwhelm them, if its possible to that is.
Pros: It’s unfair for the person who wins the most votes because could still lose.
All votes should have the same power. Giving more power to voters in low-population states is unfair, there should at least be some kind of fair in it.