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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.
No. They Republicans are thoroughly embarrassed and most of them are going to actually vote for Harris now. They are sick and tired of argregious lies and fabricated inconsistent stories and this really pushed them over the edge. They feel that racist fears of others as the sole platform for a presidency is tired and ridiculous.
If you are naive enough to wonder what their response is this far into the collapse of the GOP, you might as well go on believing this story; take advantage of whatever memory block you suffer from and at least replace your fantasy with something positive.