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Quite possibly, Trump's second term will be a disaster, and the next Democratic candidate won't have to be that great to win, like Biden in 2020. But undoubtedly there will be an actually-popular Democratic president at some point in the future, like Bill Clinton or Obama. It's hard to predict what message they'll use, though.

For a very long time, Democrats have relied on their "rainbow coalition", where they promise tons of ultra-targeted handouts meant to appeal to many different minority groups. But now many ethnic/religious minorities are leaning more and more Republican because these groups tend to be more socially conservative.
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