Nothing is impossible with programmation. In your case, you will need to save the id of the users when they vote, witch is not compatible with our polls plugin (only ip is recorded) and we need a new table to record delegations. 1 screen to delegate vote or remove delegation, 1 screen to vote, 1 screen to check and change votes. Near 60-70 hours (writing code, fixing bugs, put into production).
I'm available to customise your themes or plugins for your Geeklog CMS