In the senate it's not the case since each state currently elects twelve senators each, and each territory two. Since there are a greater number of people being

In the senate it's not the case since each state currently elects twelve senators each, and each territory two. Since there are a greater number of people being elected from the same pool, it's more likely that a minor party candidate will be elected to the senate. On the other hand, in the house of representatives you're most likely going to get a candidate from one of the major parties since most people preference them first.