Crossover Voting Law and Legal Definition

Crossover voting occurs when a voter who participated in one political party's primary election votes in the primary run-off election for an opposing political party.

For example, a voter who participated in the Republican Party primary may not vote in the Democratic Party's primary runoff.

Cross over voting is considered an election fraud in some states. Many states authorize political parties to establish rules governing its primary elections including the establishment of rules as to who may vote in its runoff election.