Why Political Polling Is Getting Harder

If you actually want to take a political survey, try moving to Iowa.

Customers compare an Apple Inc. iPhone 6, left, and iPhone 6 plus during the sales launch at an Apple store in Palo Alto, California, U.S., on Friday, Sept. 19, 2014.

Photographer: David Paul Morris/Bloomberg

A midterm election map packed with competitive Senate elections in small-population states, and plenty of money to finance those races, mean that a narrow slice of the U.S. electorate is getting bombarded with political messages—and phone calls from hungry pollsters.

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