Looks like Social Democrats and Labour are leery of being subsumed by Sinn Fein in opposition. Both would have ambitions to be the largest left party in 5 years. One of the two may go into government but if in opposition their challenge will be to stand out as strong opposition as their own distinct party, versus Sinn Fein's eagerness to keep them as two smaller parties in a SF led left coalition in 5 years. That will be interesting to watch too. They were coy enough with Mary Lou's overtures.