Thank you @KimPerales
@LightFIAR July numbers are not predictive: 1988, 2016 jump out as important counter examples. 2016 averages here: https://projects.fivethirtyeight.com/2016-election-forecast/national-polls/
Ther last successful examples of a challenge to or replacement of an incumbent resulting in victory for the incumbent's party was 1948. See 1968, 1976, 1980, 1992, and 2020 (Lincoln project) as counter examples.
#uspolitics #uspol