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If he is not competent, he can choose Michelle Obama as his running mate. It is a win-win situation for all. Nevertheless, I think you are exaggerating. He is not eloquent, but he does not have dementia either.
Your whole comment is ridiculous. “If he is not competent…”, then he shouldn’t be President! Also, Michelle Obama would never take second seat to Joe Biden in a position that is far less relevant and noticeable. She still has daughters to take care of and she doesn’t need to work or have a desire to throw herself into that fray. That’s a democratic pipe dream.