Boiler, Trump rides in a golf cart for anything more than a very short walk. Biden rides a bicycle. Trump is morbidly obese and wears a hard plastic girdle to try and hide it. Biden is physically fit. Trump has diseased skin that he tries to cover up with bronzer. Trump often babbles incoherently and at any given moment does not know who he is running against now or in the past. Finally, Trump shits himself himself day in and day out. He is unaware of when he shits himself and world leaders and government officials are forced to smell him.
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