vettrock has it right according to the traditional game. The problem is that in the traditional game, a day phase lasts ten minutes tops. That's not enough time to coordinate a foolproof vote split, so the tie vote thing is in their mostly for simplicities sake, not strategic sake.
I'm not mod, so take this with a grain of salt, but I have a suggestion: Copy the way Survivor does it
If two or more players are tied for the most votes (with at least two votes each), all players who are not involved in that tie revote, and can only vote for the players who are tied.
For example, in this situation, all players other than GL and Alexcellent revote, and may only vote for GL or Alexcellent.