If a candidate makes a totally false claim in the media should the election be invalid until every voter can prove that they have got the correct brain wash? Ob

If a candidate makes a totally false claim in the media should the election be invalid until every voter can prove that they have got the correct brain wash? Obviously not. There is no way to undo the damage from the false claim. So the results will be valid as long as election laws are followed and any dispute can be adjudicated in the courts.