Mr. Brown, who has never held elected office, has found himself outpaced by Senator Jacky Rosen, the low-key and well-financed Democratic incumbent. A debate Thursday night presents a key test.

GOP candidate Sam Brown spent Thursday’s Nevada Senate debate taking shots at Democratic Sen. Jacky Rosen, as he still faces a polling deficit with Election Day creeping nearer.

The sole debate between incumbent Sen. Jacky Rosen (D-NV) and Republican Sam Brown in Las Vegas, Nevada was a steady affair that lacked the fireworks of other Senate matchups this season. Brown, an army veteran,