A primary election is an election used either to narrow the field of candidates for a given elective office or to determine the nominees for political parties in advance of a general election.
Texas primaries are open, meaning a voter does not have to be registered as a member of a party to participate in its primary. Voters in Texas must sign a pledge when voting declaring that they will not vote in another party’s primary in the same year.
Winners in primary elections in Texas are determined by majority vote. In the case that no candidate receives more than the 50 percent of votes cast, the top two candidates proceed to a runoff election.