Without wading into the modeling wars - a debate I see as mostly fruitless - guess I& #39;ll try to summarize why I think the presidential race is more like "Lean Biden" (60%-75% range) than "Likely/Solid Biden" (90%+ range) as we head into the final night of the RNC...
1) Voters have pretty short memories compared to analysts& #39; priors. As more Americans get used to living in a pandemic, there is potential - not necessarily a likelihood, but potential - for the dominance of COVID-19 to ebb as voters& #39; top issue and other issues to rise.
2) As 2016 showed us, as Trump amplifies/intensifies/just plain makes up his attacks on his opponents, the media tends to react in a way that #bothsides-es each nominee& #39;s liabilities - real or perceived - *potentially* bringing their favs/unfavs into closer alignment.
3) At the moment, Trump is losing non-whites by a bit less than he lost them in & #39;16. Whether this holds, who knows. But the voters Trump needs to improve with to get back in contention - non-college whites - supported him before and tend to live in Trump-friendly info ecosystems.
4) Polling suggests Trump& #39;s bonus in the Electoral College (relative to the popular vote) is at least as large as it was in & #39;16 (2.9%) or potentially even larger. He could plausibly lose nationally by up to 5 points (!) and still win reelection. https://www.nbcnews.com/politics/2020-election/how-trump-could-lose-5-million-votes-still-win-2020-n1031601">https://www.nbcnews.com/politics/...
That said!! Biden& #39;s lead to date is clearly more *stable* than Clinton& #39;s was throughout & #39;16, with fewer undecided/third party voters. I still view him as the favorite. And I& #39;d welcome those tempted to label me as a "concern troll" to judge me by @CookPolitical& #39;s work in & #39;18.
FWIW, despite what the state polling averages say, I still view Biden& #39;s path of least resistance to 270 Electoral Votes as MI, #NE02, PA and *AZ,* rather than FL or WI - based on demographic patterns and what we saw from hard votes in & #39;18. Admittedly, it& #39;s a really close call.
And, just as there was a uniquely high chance of Trump winning w/ fewer votes & #39;16, today I believe there& #39;s a uniquely high chance (maybe 3-4%) of a 269-269 tie, w/ Biden carrying PA/MI/ #NE02 and no other Trump & #39;16 turf - a scenario the House would likely decide in Trump& #39;s favor.
One more thing: a lot of the factors I’ve listed are really hard to model/quantify! Especially using historical data that might not apply to recent trends.

Which is why I’m cautious of people who are really confident their quant models are super well-calibrated.
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