The errant surveys spooked some candidates into spending more money than necessary, and diverted help from others who otherwise had a fighting chance of winning.
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By Jim Rutenberg, Ken Bensinger and Steve Eder
Senator Patty Murray, a Democrat, had consistently won re-election by healthy margins in her three decades representing Washington State. This year seemed no different: By midsummer, polls showed her cruising to victory over a Republican newcomer, Tiffany Smiley, by as much as 20 percentage points.
So when a survey in late September by the Republican-leaning Trafalgar Group showed Ms. Murray clinging to a lead of just two points, it seemed like an aberration. But in October, two more Republican-leaning polls put Ms. Murray barely ahead, and a third said the race was a dead heat.
As the red and blue trend lines of the closely watched RealClearPolitics average for the contest drew closer together, news organizations reported that Ms. Murray was suddenly in a fight for her political survival. Warning lights flashed in Democratic war rooms. If Ms. Murray was in trouble, no Democrat was safe.
Republican-aligned polling suggested a tight race for Senator Patty Murray
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