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The big unknown behind Democrats' polling leads

图:Axios

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Poll after poll spells trouble for GOP candidates — in purple states and deep-red ones alike — but while Democrats see a blue wave coming, some Republicans see a polling mirage. Why it matters: Pollsters worry they're flying partly blind. Even a modest polling error could mean the difference between Republicans retaining control of Congress and President Trump facing Democratic majorities in both chambers. The big p…

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