Canada

Easy. He just has to open the constitution to make those reforms. Nothing bad ever happens when we try to change the constitution. All the provinces always agree and there is definitely no lingering constitutional issues that we haven't been able to resolve in more than four decades.

He shouldn't have made that promise. He should have been aware that electoral reforms would need to change the constitution and that every time we try do that, the country nearly implodes. So we just keep status quo until the constitutional crisis will be big enough that we can't ignore it anymore. I don't know what he was thinking. Maybe he thought we would all forget about it.