There are two main types of primaries, closed or open, that determine who is eligible to vote in the primary. In a closed primary a registered voter may vote only in the election for the party with which that voter is affiliated. For example a voter registered as Democratic can vote only in the Democratic primary and a Republican can vote only in the Republican primary. In an open primary, on the other hand, a registered voter can vote in either primary regardless of party membership. The voter cannot, however, participate in more than one primary. A third less common type of primary, the blanket primary, allows registered voters to participate in all primaries.