i just looked it up and apparently it's a pact signed onto by a bunch of states to award their electoral college votes to the winner of the nationwide popular vote, but it only takes effect once enough states have signed onto the pact so that their total electoral college votes are at or above 270. until that time, states who are members of the pact will continue to assign their electoral college votes based only on the votes from within their state. there are apparently 15 states signed onto this pact totalling 196 electoral college votes, so there is still a ways to go before any states actually use the popular vote to assign electoral college votes.
Australia