Amy Klobuchar’s Big Idea: Bipartisan Appeal Can Beat Trump

She doesn’t speak Norwegian. She never played bass in an emo-punk band. And she isn’t trying to lead a “political revolution.”

But Senator Amy Klobuchar, Democrat of Minnesota, is making a rather traditional political bet. While primary voters might flirt with flashier presidential candidates, in the end, they will settle down with a steady Midwestern senator in 2020.

“People are so mad about Donald Trump and the Republicans,” she said during a recent interview in Des Moines. “But remember, this is about actually getting things done. And first of all,...