2020 race: The one thing 23 Democrats aren’t talking about

Can U.S. foreign policy be a winning campaign issue? Republicans have traditionally had an advantage on national security, but Democratic dark horse Seth Moulton wants to flip that script in the 2020 race.

Of all the Democrats vying to be leader of the free world, Seth Moulton may be the only one who actually talks much about the world.

An ex-Marine who served four combat tours in Iraq, Representative Moulton of Massachusetts has tried to stand out in the crowded field of Democratic presidential candidates by emphasizing military and foreign-policy...