Senate Minority Leader Chuck Schumer has long prided himself on a singular skill—picking winners. His recruitment coups in North Carolina, Alaska and Ohio this cycle were hailed as masterstrokes. But in a series of high-stakes primaries unfolding across Maine, Iowa, Michigan and Minnesota, his once-formidable machinery is colliding headlong with a Democratic base increasingly hostile to Washington leadership and increasingly indifferent to electability calculations. The result is a