The big “O” carved outside the newest presidential library obviously stands for Obama.

But for the man who succeeded the nation’s first Black president in the Oval Office, it stands for something else — obsession.

For at least 15 years, since Trump first launched the racist birther lie that Barack Obama wasn’t born in America, Trump has been fixated on a man whose shoes he could never fill.

And it was just months ago that Trump posted a racist video portraying Obama and former First Lady Michelle Obama as apes.

Trump at the time blamed the post on a staffer, and deleted the video after an outcry.

“Look, you got to ask him what it is — the obsession,” Obama said last week on a podcast hosted by former NBA players Matt Barnes and Stephen Jackson. “I obviously, you know, have a room in his head — a suite — in his head.”

Obama’s name has been falling........

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