By mannerisms, personality, whatever you want...
Hillary Clinton = Cersei Lannister
Tim Kaine = Lord Varys
Donald Trump = Petyr Baelish (Littlefinger)
Mike Pence = Davos Seaworth
Gary Johnson = Theon Greyjoy
Jill Stein = Melisandre
Donald Trump=Tywin Lannister, uses his immense wealth to curry political favor, until he finally decides that perhaps it's just best to rule directly
Hillary Clinton=Danerys Targarean, last member of a powerful ruling family, trying to buck tradition by having a female lead, large army of followers behind her
Tim Kaine=Keven Lannister, bland, competent, unmemorable second in command type
Mike Pence=Lancel Lannister. Religious fanatic, not too bright
Gary Johnson=Mance Rayder. Cool character, but sort of disconnected from the rest of the story, and doomed.
Bernie Sanders=Jaquen H'ghar. Interesting, but probably out of the picture for now.