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A judicial retention election (or retention referendum) is a periodic process in some jurisdictions whereby a judge is subject to a referendum held at the same time as a general election. The judge is removed from office if a majority of votes are cast against retention.
A judicial retention vote differs from a regular election in that voters are not asked to choose from a list of candidates — the judges on the ballot do not have opponents. Rather, the voter chooses between electing the incumbent judge to a further term in office (i.e. voting in favor of "retention") or voting against. In addition, the judge's party affiliation is typically not listed on the ballot.  A judge is deemed to have been retained if ballots cast in favor of retention outnumber those against.
Shall each of the persons listed be retained in office as Judge of the Appellate Court, First Judicial District?
Michael J. Gallagher, Yes or No
Margaret Stanton McBride, Yes or No
Additional instructions on the ballot made clear that "no judge listed is running against any other judge" and that voters were able to vote "yes" on both, "no" on both or "yes" on one and "no" on the other.
In 1934, Judicial retention elections were first used by California's state court system to fill vacancies.  (Text of the law may be seen below.) These retention elections served as an alternative to elections which were previously contested. After appointment by the governor and confirmation by the Commissioner on Judicial Appointments, an incumbent judge would appear on the ballot without an opponent and voters would vote for or against.  If the judge received a majority of votes, he or she would be elected to serve.
- California State Constitution: Article VI, Section 16 d. 
(1) Within 30 days before August 16 preceding the expiration of the judge's term, a judge of the Supreme Court or a court of appeal may file a declaration of candidacy to succeed to the office presently held by the judge. If the declaration is not filed, the Governor before September 16 shall nominate a candidate. At the next general election, only the candidate so declared or nominated may appear on the ballot, which shall present the question whether the candidate shall be elected. The candidate shall be elected upon receiving a majority of the votes on the question.
In 1937, the American Bar Association endorsed retention elections for judges.
Growing distaste of politics and corruption affecting the gubernatorial appointments of judges brought about the reform when selecting judges. In 1940, the state of Missouri adopted the Missouri Plan, which contained a judicial retention process similar to that of California. This plan which is also known as the merit system, was proposed by Albert M. Kales, co-founder of the American Judicature Society.  Under the Missouri Plan, judges were to be nominated by a council of lawyers and laypersons. A list of candidates would then go to the governor, who would choose a candidate. It was noted that the Missouri Plan needed a form of public accountability so it was decided that, after an election cycle had passed, the judicial candidate would be subject to periodic, public retention elections.
- Arizona1,2 (Some Trial Judges are elected).
- New Mexico1,2 (57% 'yes' votes needed for retention)
- North Carolina1 (Only for Supreme Court level)
- South Dakota1
1 Appellate Court Retention Election
2 Trial Court Retention Election
Many legal scholars[ who?] disapprove of any form of judicial elections on the grounds that they may undermine the independence of the courts and encourage judges to act as politicians. It is argued that of the three branches of government (legislature, executive, and judiciary) the judicial branch should be the least concerned with public opinion, but that retention elections cause judges to take into account the view of the electorate when deciding cases. It is also argued that retention elections may lead to corruption because to successfully run for public office money and campaigning is needed. This may allow interest groups to take advantage of the system by giving money in exchange for favourable rulings by individual judges.[ citation needed]
- Larry Aspin; William K. Hall; Jean Bax; Celeste Montoya (2000). "Thirty Years of Judicial Retention Elections: An Update". Social Science Journal. 37 (1): 1–17.
- "Specimen General Election Ballot; Chicago, Illinois; Tuesday, November 4, 2008". Archived from the original on July 15, 2011.
- B. Michael Dann; Randall M. Hansen (June 2001). "Judicial Retention Elections" (PDF). Loyola of Los Angeles Law Review. 34 (1429): 1443–1444.
- Darcy, R. "Conflict and Reform: Oklahoma Judicial Elections 1907 - 1998" (PDF). Archived from the original (PDF) on 30 August 2011. Retrieved 22 March 2011.
- "State Constitution". California State Constitution, Article VI: Judicial. Retrieved 27 March 2011.
- ABA Coalition for Justice; updated by the American Judicature (2008). Judicial selection the process of choosing judges (PDF). [Chicago, Ill.]: American Bar Association, Coalition for Justice. ISBN 978-1-60442-733-2.
- "Judicial Selection and Service (Tables 4-11)". Judicial Selection and Retention Resource Guide. National Center for State Courts. Retrieved February 22, 2011.
- Iowa Judicial Branch, Judicial Retention Elections