I don't see it being a Beto/Sanders ticket. The presidential candidate usually has to balance themselves with their VP pick and if the democratic nomination is an especially hard fight, either of them is going to have to balance the ticket with identity politics. Specifically, they'll have to make their VP pic a woman or person of color. Not because they would be the best choice (VP's rarely are) but because it would get the party to unify behind them. That's part of what killed Hillary in 2016; she didn't heal the rift that came from her competion with Sanders.
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"If you cling to something as the absolute truth and you are caught in it, when the truth comes in person to knock on your door you will refuse to let it in." ~ Siddhartha Gautama
"If you cling to something as the absolute truth and you are caught in it, when the truth comes in person to knock on your door you will refuse to let it in." ~ Siddhartha Gautama