I can think of a few possibilities, but first one has to make them all agree to a common platform, quite task but already being worked on. If the Communists weren't so damn chiliastic and negative towards every possible colaboration (they see all options as "strengthening capitalism"), this coalition thing would be workable already. As things stand I would only wager on abstention becoming the largest "party"...

The road of excess leads to the palace of wisdom - William Blake