Over the past 18 months, journalists, political watchers, and researchers have offered numerous reasons for the rise of Donald Trump. The Washington Post's Max Ehrenfreund reports that Gallup has added another potential explanation to the list: expensive mortgage-interest payments.

According to the analysis, respondents in hundreds of surveys were more likely to view Trump favorably if they lived in Zip codes with heavy mortgage-interest burdens relative to local incomes, after taking into account a range of socioeconomic factors.

But Ehrenfreund points out that housing is only one factor in the Gallup poll.

The respondents also were more likely to view Trump favorably if they lived in Zip codes where more of their neighbors received the Earned Income Tax Credit, which the government pays to low-wage workers, or where a greater share of income came in the form of checks from Social Security for the elderly or disabled.

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