Yeah, the obvious answer is Cubans.
Cuban voters may not be voting Republican for President anymore, but they sure still vote R downballot.
In my humble opinion, we should wait until 2020 before making such predictions.
This. I think Cubans very well might come home in 2020; they seem to have warmed up to Trump.
Based on what? Has there been polling to substantiate this or is it just a gut feeling?
Also, while I do think it's plausible that Cubans will swing towards Trump if Sanders (especially) or Warren is the nominee, if it's Biden I highly doubt it. They will probably actually swing farther away from him, because Biden is a Catholic and will likely be seen as more moderate than Hillary; it will be very difficult for the GOP to paint him as a socialist, unlike Sanders.
