More likely to become first female President of the United States?

[Mr. Morden]

Warren is the most likely woman to be elected in 2020, IMHO.  However, Harris is the most likely to become the first woman elected at some point in time, simply because she's still in her 50s and so will have several more opportunities after 2020, while Warren won't.  As recently as a few months ago, I would have said Gillibrand rather than Harris, but since then Harris has gone up in odds of running for prez in 2020, so I think I'd pick her now.