The raw data behind the story 'How FiveThirtyEight's 2018 Midterm Forecasts Did' https://fivethirtyeight.com/features/how-fivethirtyeights-2018-midterm-forecasts-did/
forecast_results_2018
A dataframe with 1518 rows representing forecast results (as of December 3, 2018) and 11 variables:
cycle of the election
branch of the election
election forecast for the gubernatorial race
the date of the forecast
version of the election forecast
the probability of winning for the Democrat
the probability of winning for the Republican
the predicted political affiliation of the forecast
whether the Democrat won
whether the Republican won
if a race was uncalled
FiveThirtyEight's 2018 House Forecast https://projects.fivethirtyeight.com/2018-midterm-election-forecast/house/