The Upshot: “To provide a better gauge of results than the raw vote count, The Upshot is adjusting Senate returns, based on where those returns come from and which parts of a state have not yet reported their votes. If we know the vote from a Democratic-leaning city is outstanding, for example, we will adjust the count toward the Democrat.”
FiveThirtyEight: “Throughout the evening on our live blog, we’ll be publishing an updated probability that Republicans or Democrats win the Senate, along with their probabilities of winning the key Senate races. These probabilities will use FiveThirtyEight’s final pre-election forecast as a baseline, which gave Republicans a 76 percent chance of winning the Senate. But they’ll deviate from them as our partners at ABC News project winners in each state.”

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