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Home Exclusive Social Psychology Political Psychology Donald Trump

Study: Divided parties rarely win presidential elections

by University of Georgia
March 17, 2016
in Donald Trump, Political Psychology
Photo credit: DonkeyHotey

Photo credit: DonkeyHotey

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Divided political parties rarely win presidential elections, according to a study by political science researchers at the University of Georgia and their co-authors. If the same holds true this year, the Republican Party could be in trouble this presidential general election.

The study, which examined national party division in past presidential elections, found that both national party division and divisive state primaries have significant influence on general election outcomes.

In this election cycle, the nominee of a divided Republican Party could lose more than 3 percent of the general election vote, compared to what he would have gained if the party were more united.

“History shows that when one party is divided and the other party is united, the divided party almost always loses the presidential election,” said Paul-Henri Gurian, an associate professor of political science at UGA’s School of Public and International Affairs. “Consider, for example, the elections from 1964 through 1984; in each case the divided party lost.” The study measures party division during the primaries and indicates how much the more divided party loses in the general election.

The study found that divisive state primaries can lead to a 1 to 2 percent decrease in general elections votes in that state. For example, Hillary Clinton received 71 percent of the Democratic vote in the Georgia primary, while Donald Trump received 39 percent of the Republican vote. According to the historical model, a Republican-nominated Trump would lose almost 1 percent of the Georgia vote in the general election because of the divided state primary.

National party division has an even greater and more widespread impact on the national results, often leading to decreases of more than 3 percent nationwide.

Looking again at the current presidential election cycle, Trump had received 39.5 percent of the total national Republican primary vote as of March 16, while Clinton had received 58.6 percent of the Democratic vote. If these proportions hold for the remainder of the nomination campaign (and if these two candidates win the nominations), then Trump would lose 4.5 percent of the vote in the general election, compared to what he would have received if the national Republican Party was not divided.

“In close elections, such as 2000, 2004 and 2012, 4-5 percent could change the outcome in terms of which party wins the presidency,” Gurian said.

The results of this study provide political analysts with a way to anticipate the impact of each primary and, more importantly, the impact of the total national primary vote on the general election results. Subtracting the percent of the Republican nominee’s total popular vote from that of the Democratic nominee and multiplying that by 0.237 indicates how much the Republican nominee is likely to lose in the November election, compared to what would otherwise be expected. The 4.5 percent figure calculated through March 16 can be updated as additional states hold their primaries. (The same can be done for each individual state primary by multiplying by 0.026.)

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