We have ONE (1) senate seat.
The Liberals are in the same situation.
This seems like a good time to pull out my crudely-assembled chart:
Looking at this chart I see seven Senators who are undeniably on the left of the political spectrum. To claim that the five TPP Senators are somehow centrists or rightists is absurd if you look at their voting and legislative record and their political philosophy. The mere fact they aren't part of the Liberal Party or the Labor Party doesn't make these guys conservative ...