Good luck with that Durbin
He isn’t doing away with the Electoral College - which would take an Amendment.
He is demanding that the states join a pact to allocate their Electoral Votes to whoever wins the popular vote, which simply takes state legislation.
Most states would have be insane to do this, but you never know. Insanity is pretty widely spread these days.
Fortunately, these days most governors and legislatures are ‘Pubbie, which reduces the chance.