From PredictIt, 4:30pm ET: Republican/Democratic win probabilities back to where they were the day before the debate.
Source: Predict, accessed 7/24/2024, 4:30pm ET.
Just to confirm that these are not anomalous, here are the RealClearPolitics betting averages:
Source: RCP, accessed 7/24/2024, 4:30pm ET.