Politically speaking, Marie Herring, a 49-year-old supporter of Elizabeth Warren, and John Thomas Grindle, a 36-year-old Bernie Sanders fan, have a lot in common.

Both Iowans want Medicare for All, student-debt cancellation, and a government that taxes the heck out of billionaires. Neither harbors ill will toward the other lefty firebrand in the race. But the two voters feel very differently about one 2020 Democrat: South Bend, Indiana, Mayor Pete Buttigieg.

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