If Biden had remained the Dem. nominee, would Trump's margin of victory been larger or smaller?

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It would’ve been a wash, for sure. The problem is that Kamala was seen as Biden 2.0, and a majority of Americans did not want that.

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Today, analysts were saying one of the problems is that Kamala was saying she’s not Biden but yet when asked what she would do differently, she couldn’t elaborate.

I don’t know. I think Harris was just a bad candidate. She was unwilling to honestly answer very important questions without going into gobbledygook or “word salad” nonsense. In my view (and apparently many others too) she was a two dimension candidate in that she presented as a bold and powerful politician but it was only a facade. Look at her from the side and there was nothing there other than Trump is evil and woman’s health issues.

Biden has serious issues too of course.

Sad situation for the Democratic Party being stuck with those two.

6 of one, half a dozen of the other. Biden is and has been in cognitive decline. It was finally admitted after the debate with Trump. That performance showed what has been happening for a long time and being covered up. That deception could have caused a greater gap. But Biden was more likeable than Kamala. Kamala was never supposed to be the Dem’s nominee and I fully believe that Joe Biden endorsed her as a final “fuck you” to those that ousted him from the race. That endorsement left no other options for someone else to walk in cold…legitimately. Kamala did zero press conferences, went for over a month before even doing softball, scripted interviews. None of her answers held any substance. She never did lay out her standards, values, plans or policies for the futures…nothing. Every speech changed depending on who she was talking to. Often her accent changed just as quickly. She showed herself to be an empty suit that thought the American public was too dumb to notice and that her uber-rich friends would carry the day.

The choice you are asking is would the choice between someone with dementia or someone that is an obvious puppet was a better choice to vote for as the leader of the free world.