It doesn’t matter how many times you say it, it doesn’t make it true.
If two marry and one finds out later the other one is already married to someone else - one was not legally fit to marry. The marriage is null and void. It was NEVER legal. It’s time for you to get your head in gear!
Maybe it’s not true on your fantasy island but here in the real world Obama is in the Oval office. The military salute him, Congress sends legislation for signing and the Judiciary swore him in. That’s because he is recognised as the LEGAL sitting President.
The reason it is that way is because 60+ million crazies voted for him and because no-one has come up with any evidence that he shouldn’t be.
Google "de facto officer doctrine."