Let's dispel with this fiction that Barack Obama doesn't know what he's doing. He knows exactly what he's doing.
This is an argument that has been advanced in the writings of some movement conservative commentators. It's not something Rubio made up just to bolster his argument. After being treated non-stop to the arguments of how incompetent Obama is, this one was so dissonant that Rubio should have seen it for the non-starter it was. Instead, he quadruped down on it. Big mistake. Big. YUGE.
The cognitive dissonance between the twin Republican caricatures of Obama is obvious. Is he an incompetent dope, or is he a scheming, Alinskyite genius? How could he be both at the same time?
Republicans do not usually acknowledge the contradiction. Donald Trump is an exception, actually, siding firmly and exclusively with the incompetence critique.