Or rather, its past. Ancient Greek democracy wasn't perfect (slavery; not everyone was citizen) but it was much better than our current system of professional politicians and uber-powerful political parties and lobbies.
The small, first struggle will be to implement it as securely as possible - for this you'll likely need to distribute specific hardware[2]. The second and largest struggle would be to actually change constitutions and take power away from the organizations that have hoarded it for decades[3].
There is a lot of scepticism in these comments. My infosec and analytical side is obviously going to go into full-attack mode when there is something solid to take apart - BUT for the time being I'd like to say a huge "bravo" to both this team and YC for backing them.
I hope you change the world.
[1] how would it work; why would people care to get involved; execution/implementation issues; fraud; ...
[2] something between RSA tokens and dedicated mobile voting machines
[3] probably centuries