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After months of campaigning and billions of dollars spent on the US midterms, election day is finally here.
According to the latest public opinion surveys, Democrats appear to have the upper hand - but polls haven't always been reliable, and this year could have its own share of surprising results.
In broad strokes, however, there are three possible outcomes after Americans have their say.
Here's a look at what they could be, what the early signs might be as results come in – and what it could mean for the country.
