According to PredictIt, 4:30 p.m. ET: Republican/Democratic victory odds return to where they were the day before the debate.
Source: Predict, accessed 07/24/2024, 4:30 p.m. ET.
Just to confirm that these are not anomalies, here are the betting averages from RealClearPolitics:
Source: RCPaccessed 07/24/2024, 4:30 p.m. ET.
