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updated 7/6/2010 3:56:12 PM ET 2010-07-06T19:56:12

Science is confirming something successful politicians seem to know instinctively — support your local football team.

The success of major college teams in the two weeks before an election can have a measurable impact on how well incumbent politicians do at the polls in the U.S., researchers report in Tuesday's edition of Proceedings of the National Academy of Sciences.

"Events that government had nothing to do with, but that affect voters' sense of well-being, can affect the decisions that they make on election day," the researchers said.

That's why incumbent politicians try to score some good news just before elections, and their opponents try to block that effort.

The new study looked at U.S. elections for president, governor and senate between 1964 and 2008 and compared them to football results for 62 major college teams. The researchers found that wins in the two weeks before an election boosted the vote share of incumbents in the county where a school is located by 1.05 to 1.47 percentage points — enough to make a difference in a close race.

And for teams they termed "powerhouses" the impact was even greater, giving the incumbents between 2.30 and 2.42 percentage points more than in years when the local team lost. Powerhouses were defined as teams that had won a national football championship since 1964, or were among the teams with average attendance of 70,000 or more from 1998 to 2008.

Neil Malhotra, an assistant professor of political economy at Stanford University, and colleagues, decided to look at the relationship between football and politics because they wondered if elections were affected by "irrelevant" information.

There has been a lot of discussion of the rationality of the American public when it comes to voting, Malhotra said in a telephone interview, but there have also been studies indicating people can be "predictably irrational."

For example, a prior study looked at disasters such as floods and hurricanes, and found that people later tended to vote against incumbents.

"Just because government didn't cause the problem doesn't mean people won't hold them responsible," Malhotra observed.

But, in a disaster, governments do tend to get involved, at least afterward.

So the researchers turned to an area even more unrelated to government: sports.

It tends to be a subconscious response, Malhotra explained, with people making a decision on whom to vote for acting on their mood. The effect tends to disappear when the bias is brought to people's attention, he added.

The study did not report results by individual school or conference, but combined the results from 1964 to 2008 to incorporate winning and losing years and several elections.

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