What Prediction Markets Show Despite the shift in polling, prediction markets strongly favor Republicans in the race. What Prediction Markets Show Prediction markets favor a Democrat win in the race. VoteHub’s polling average in April had Republicans with a 0.1 percent lead, though July’s average shows Democrats with a 0.9 percent lead. What Prediction Markets Show Despite the shift in polling, prediction markets strongly favor Republicans in the race. VoteHub’s polling average in April had Republicans with a 0.1 percent lead, though July’s average shows Democrats with a 0.9 percent lead.