Also called vote swapping, vote pairing is an election system that allows people to vote tactically. A person who engages in this sort of vote trading agrees to vote for a less-preferred candidate who has a greater chance of winning in his district, and in exchange, a voter from another district agrees to vote for the candidate the first voter prefers. Though the practice is fairly informal, it can sometimes be quite sophisticated and involve websites that pair up voters. Is the practice legal? Discuss
Source: The Free Dictionary