Can Trump defy the polls again?

Opinion polls suggest Republicans are heading for significant losses in this week's US midterm elections. 

Democrats are heavily favoured to win back the House of Representatives, and the battle for the Senate is increasingly tighter. 

But could Donald Trump defy the polls and pull off another upset?

Today, Matt Taglia, senior director at Emerson College Polling, on what the polls are telling us and whether they'll get it right this time. 

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Matt Taglia, senior director at Emerson College Polling