[jason taylor]

One version which is kind of like this is that each legislator retains the votes cast for him all through his term and proxies them at will. The effect would be a weighted legislature.

A more mundane version is that this system is used only during referendums and special elections.

Still another would be appropriate for a community with an adventuring tradition. Someone who has to go trading, fighting, or animal driving can leave his vote behind with a friend or family member or hired manager whatever orders for how it is to be wielded.