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Why do political polls sometimes show wildly different results?

Pollsters are increasingly divided on how to best poll voters, including whether to use online or telephone polls and the balance of landlines versus cell phones.
Pollsters are increasingly divided on how to best poll voters, including whether to use online or telephone polls and the balance of landlines versus cell phones.

Two recently released political polls show wildly different results for Indiana’s statewide campaigns — from Democrats nearly tied in races for governor and attorney general, to  Republicans with huge leads.

So, why are there such discrepancies in public polling?

Chad Kinsella, Ball State University associate professor of political science, said political polls can be entertaining and interesting. But he said they represent just a “test of a moment in time.”

“Kind of like sticking your finger in the air and you get a sense of where things are in a moment,” Kinsella said.

Kinsella said polling is getting more difficult. Pollsters are increasingly divided on how to best poll voters, including whether to use online or telephone polls and the balance of landlines versus cell phones.

There’s also the challenge of getting people to respond, choosing how many people will yield a good result, and what demographics to weigh in the sample.

“Everybody’s kind of got their secret sauce, if you will,” Kinsella said. “And sometimes the secret sauces work and sometimes they don’t.”

READ MORE: These are the most common mistakes election boards see on mail-in ballot applications, at the polls

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Kinsella said Indiana also isn’t polled very often, in large part because its political results haven’t changed in a while.

The recent poll that showed  Democrats in tight races was from a polling firm contracted by Democratic attorney general candidate Destiny Wells.

Kinsella said releasing those results was a smart campaign move.

“Democrats in this state need something to get excited about,” Kinsella said. “Even if it turns out not to be correct, to try to build some momentum — because there hasn’t been any momentum for quite some time.”

Democrats haven’t  won a statewide race in Indiana in more than a decade.

Brandon is our Statehouse bureau chief. Contact him at  bsmith@ipbs.org  or follow him on Twitter at  @brandonjsmith5 .

Brandon J. Smith has previously worked as a reporter and anchor for KBIA Radio in Columbia, MO. Prior to that, he worked for WSPY Radio in Plano, IL as a show host, reporter, producer and anchor. His first job in radio was in another state capitol, in Jefferson City, as a reporter for three radio stations around Missouri. Brandon graduated from the University of Missouri-Columbia with a Bachelor of Journalism in 2010, with minors in political science and history. He was born and raised in Chicago.