Definitions for "Dark Horse"
an unexpected, unknown winner or person nominated for political office
a political candidate who is not well known but could win unexpectedly
a candidate or contender that no-one expects to win that suddenly does win, or looks like it might
Keywords:  sharpton, black, he
Al Sharpton, but not because he's black
Keywords:  racehorse, little, known
a racehorse about which little is known