A Mars ballot is one in which the person voted in only one of the many races.  Normally, in a presidential election, there are only 100 Mars ballots in the entire country and these are split 50% for each candidate.  In the current election there were at least 450,000 Mars ballots and in each case the vote was for Joe Biden.  The statistical probability of this occurring is the probability of you waking up in the morning and finding yourself changed to the opposite sex and changed to the skin color of a different race and inside of a clear plastic bubble hovering over the surface of the planet Mars.