brandon

No, these states agree to commit their electors to the winner of the national popular vote. This would make it impossible for one candidate to win the election having lost the national popular vote.

Right, the key is that now the electoral college does not necessarily have the same result as the popular vote.

This agreement, if in effect, will ensure that the EC result matches the popular vote.

Not quite for a five year old but: These states have agreed with each other to allocate their votes in the electoral college to the candidate who wins the national popular vote. The agreement only goes into affect once states controlling 270 electoral college votes have signed on. This is the amount required to win the presidency, so at that point the popular vote winner will necessarily win the election.

It’s likely that this agreement would face challenges in court if/when it eventually goes into effect.

It does not end first past the post voting. If it went into effect it would essentially mean that the popular vote would determine the outcome of the presidential election, by forcing the electoral college results to match. The popular vote would still be first past the post.