Wednesday on the NewsHour, the presidential candidates stump in Wisconsin and New York ahead of upcoming primaries. Also: A look at what’s driving Trump’s appeal, the past and future of U.S. policy in the Middle East, how a Colombian peace deal could impact the drug trade, the battle for conservation in Coachella Valley and decaying books tell the story of Slovakian Jews in the Holocaust.

The show’s own verdict is on its page.