What I mean is the states that are overrepresented based on their population. In EC, every state, regardless of population gets 3 electoral votes. Meaning low population states get more say than they should because they get electoral votes for free. This has caused elections in the past to be won because of this overrepresentation when they wouldn't have if the electoral college didn't exist.

A few percentage points is a big deal in an election where every vote is supposed to count. And this overrepresentation isn't a narrow margin like Brexit, we're talking about at least 5% more represented.