If Donald J. Trump has a path to the presidency with big gains among white working-class voters, it has to run through Pennsylvania — a disproportionately white, blue-collar state with few Hispanic voters.
But a New York Times Upshot/Siena College poll released Thursday indicates that Pennsylvania remains out of reach for Mr. Trump.
Hillary Clinton leads him by seven percentage points, 46 percent to 39 percent, in a four-way race. And in a contest that could decide control of the Senate, the Republican senator Pat Toomey trails the Democratic challenger Katie McGinty by three points.
