22 January 2017

The Conversation: Are third-party candidates spoilers? What voting data reveal

We looked at how voter turnout interacted with the voting performance of third-party candidacies. We took into consideration the expansion of the voting franchise through the 15th Amendment, which granted universal male suffrage; the 19th Amendment, which extended the vote to women; the 26th Amendment, which lowered the voting age to 18; and the Voting Rights Act. We also compensated for historical and demographic trends.

We found that not only do third-party candidacies fail to increase turnout, they are actually associated with a statistically significant reduction in turnout. Put simply, fewer people vote in elections in which third-party candidates receive a substantial portion of the vote. [...]

But the overriding fact is that when controlling for the expansion of the voting pool, turnout does not vary widely from one election to the next. That suggests that most voters go to the polls because they want to vote, not because they are motivated by any particular candidate. The one exception to this rule appears to be Ross Perot’s candidacy in 1992. But the one thing that distinguished his candidacy was the US$100 million of his own money he had to spend. By way of contrast, Jill Stein raised and spent about $3.5 million in the latest campaign cycle.

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