This only happens once in a generation. It is a climactic event.
Before validation, reporters and pundits will come to their work with an assumption that the political winds are blowing in one particular direction. After validation, they will always come to their work with an assumption that the political winds are blowing in a different direction. Their successors will take this new direction as a given.
After Nixon won in 1968, Democrats refused to believe for a decade that the New Deal Coalition was truly dead, and could not be recreated. The truth only dawned on them after Ronald Reagan’s victory in 1980, and his emphatic re-election in 1984, validated the strength of the Nixon Coalition. He had been considered extreme, “the man who nominated Goldwater,” and his natural caution kept him from entering the 1968 race until it was too late.