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Barack Obama threw down for 12 beers at the Iowa State Fair yesterday — like a boss — and the crowd loved every second of it … shouting “FOUR MORE BEERS!”

The video’s hilarious — Obama even tells the crowd, “Hey everybody who’s over 21, you gotta buy a beer!”

Watch Barack Obama at the Iowa State Fair!

But it wasn’t as simple as walking up to the counter — before Obama came anywhere near the Budweiser tent, his security team descended in full force … casing the perimeter with bomb-sniffing dogs.

Once the coast was clear, the user who posted the pics says BO shelled out cash for 12 beer tickets — two for himself … and ten for the next ten customers to approach the tent.