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She set a tone at the very start when she walked right into his space to shake his hand and made him almost pull back into himself in response. She was in charge and never stopped being in charge.
Harris also managed what neither Joe Biden nor Hillary Clinton nor any of the 2016 Republicans managed to do which is successfully bait Donald Trump and get under his skin. Within a few minutes Trump was visibly angry and not in a way that empowered him but in a way that made him lose focus, go down rabbit holes and generally go off onto damaging tangents. Spittle anger, not righteous anger, shall we say.
It’s not just about president it’s about party. Someone might not like Trump. But at the same time dislike democratic policies and democrats as a party.
So now the have to decide. Do they go against Republicans due to their candidate? Hearing Kamala debate him might convince them that yeah… ok. They’re not THAT bad… at least they (democrats) are better than him (Trump)