Either way, these threads aren't often accurate. (Who would have predicted Sanders or Trump running in 2012? Who would have predicted Cain running in 2008?)
That's the fun of it: trying to predict the unpredictable.
This, plus looking back on these when 2020 rolls around is lots of fun as well.
GOPMarco Rubio
Ted Cruz
Rand Paul
Nikki Haley
Tim Scott
Paul Ryan
Rob Portman
WILD CARD!!!!: John Hoeven*
DemocratsCory Booker
Tim Kaine
John Bel Edwards
Chris Murphy
Kamala Harris
Terry MacAuliffe
Gavin Newsome
WILD CARD!!!!: Joe Manchin*
* I don't think the people I've selected as "wild card" will actually run or receive major speculation, but I think it would be interesting if they did.