I wonder if the RNC’s excitement over the successful D-Day landings was tempered by the knowledge that their national convention was scheduled for 3 weeks later. I wonder how history would be different if Ike had been forced to release his prepared message accepting full responsibility for the failure of the landings. Would we have gotten a President Dewey in ‘44?
Or would M'Arthur have reemerged as a "no, I'm really not a candidate, but ..."?
Possibly, but the simple fact is Overlord could not have failed. It was too big, too well planned and had such overwhelming force and logistics support that the Germans could not possibly stop it.
The worst that could have happened was failure on Omaha Beach. Which would have been made up by using the other beaches.
Dewey is a poor candidate running against very popular incumbent who is benefiting from a well run war.