Electoral reform? You mean it is not impossible?
Consider the sequence of events.
1. Third party candidate allowed to participate in debates. Does well. Polls show third party might matter, might have good ideas.
2. Election takes place, where third party gets hammered, because of crooked election laws.
3. But because neither of major state-sponsored parties has a majority, third party is able to extract promise to make election law more open and less crooked.
If it happened in England, could it happen in the US? Answer: Probably not, because in the US we can't even get to step 1. Voters can't like what they can't see.
(Nod to Anonyman)