Amy Klobuchar and Elizabeth Warren

American voters must choose between three sharply divergent visions of the future.

The incumbent president, Donald Trump, is clear about where he is guiding the Republican Party — white nativism at home and America First unilateralism abroad, brazen corruption, escalating culture wars, a judiciary stacked with ideologues and the veneration of a mythological past where the hierarchy in American society was defined and unchallenged.

On the Democratic side, an essential debate is underway between two visions that may define the future of the party and perhaps the nation. Some in the party view President Trump as an aberration and believe that a return to a more sensible America is possible. Then there are those who believe that President Trump was the product of political and economic systems so rotten that they must be replaced.

The Democratic primary contest is often portrayed as a tussle between moderates and progressives. To some extent that’s true. But when we spent significant time with the leading candidates, the similarity of their platforms on fundamental issues became striking.