The reasons here are mainly statistical. Third parties may have statistically significant support (maybe 15 percent of voters in every district supports a third party). But in an SMDP system, the third party may well not win any seats. So those voters will likely join with another party and look for a compromise candidate that could represent them. Similarly, suppose that a district has 200,000 conservative voters and 110,000 liberal voters. One would expect a conservative candidate to be elected. But if two conservative parties each run a candidate, then a liberal candidate may well be elected – unless the conservative parties unite behind a single candidate.


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