Democrats’ Shady Crossover Voting Strategy Could Upend GOP Primaries

Crossover voting is when a voter participates in a primary election for a political party with which they do not generally affiliate. Crossover voting can occur in states with open primaries, which do not require one to be a member of a party to participate in a party’s primary. In these states, a voter may choose to vote in the partisan primary of his or her choice. 

To vote for a presidential candidate, residents with no party preference must request a crossover ballot or register with one of the parties.