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| Iowa State Senate District 12 | ||
| Current incumbent | Mark Costello  | |
Iowa's twelfth state senate district is represented by Republican Senator Mark Costello.
Iowa state senators represent an average of 60,927 residents. After the 2000 Census, each member represented 58,586 residents.
Members of the Iowa State Senate serve four-year terms and are not subject to term limits. Half of the senate is up for re-election every two years. Iowa legislators assume office the first day of January after their election.
The Iowa Constitution states, "Senators shall be chosen for the term of four years, at the same time and place as representatives; they shall be twenty-five years of age, and possess the qualifications of representatives as to residence and citizenship."
| State legislators | |
|---|---|
| Salary | Per diem |
| $25,000/year | $168/day |
If a vacancy occurs in the Senate, the governor must call for a special election within five days of the vacancy. If the vacancy happens while the Senate is in session, the governor can call the election to be held as soon as possible. However, a minimum 18-day notice is required. All other special elections require a 45-day notice as long as there are no school elections scheduled on the same day.
Elections for the office of Iowa State Senate will take place in 2020. The general election will be held on November 3, 2020. A primary is scheduled for June 2, 2020. The filing deadline is March 13, 2020.
Elections for the Iowa State Senate were held in 2016. The primary election took place on June 7, 2016, and the general election was held on November 8, 2016. The candidate filing deadline was March 18, 2016.
Incumbent Mark Costello defeated Don Brantz in the Iowa State Senate District 12 general election.Iowa State Senate, District 12 General Election, 2016
| Party | Candidate | Vote % | Votes | |
|---|---|---|---|---|
| Republican |  Mark Costello Incumbent |
78.37% | 20,012 | |
| Libertarian | Don Brantz | 21.63% | 5,524 | |
| Total Votes | 25,536 | |||
| Source: Iowa Secretary of State | ||||
Iowa State Senate, District 12 Republican Primary, 2016
| Party | Candidate | |
|---|---|---|
| Republican | Mark Costello Incumbent (unopposed) |
Mark Costello (R) defeated Steven L. Adams (D) and Don W. Brantz (L) in the special election on December 30.
The seat was vacant following Joni Ernst's (R) election to the United States Senate on November 4, 2014.
A special election for the position of Iowa State Senate District 12 was called for December 30. The filing deadline for candidates wishing to run in this election was December 16.
Iowa State Senate, District 12, Special Election, 2014
| Party | Candidate | Vote % | Votes | |
|---|---|---|---|---|
| Republican | Mark Costello |
74.7% | 3,138 | |
| Democratic | Steven L. Adams | 22.2% | 932 | |
| Libertarian | Don W. Brantz | 3.1% | 132 | |
| Total Votes | 4,202 | |||
Elections for the office of Iowa State Senate consisted of a primary election on June 5, 2012, and a general election on November 6, 2012. The signature filing deadline for candidates wishing to run in this election was March 16, 2012. Incumbent Joni Ernst (R) was unopposed in both the general election and Republican primary.
From 2002 to 2016, candidates for Iowa State Senate District 12 raised a total of $757,239. Candidates who raised money in contributions earned $50,483 on average. All figures come from Follow the Money.
Campaign contributions, Iowa State Senate District 12
| Year | Amount | Candidates | Average |
|---|---|---|---|
| 2016 | $33,314 | 2 | $16,657 |
| 2012 | $90,539 | 2 | $45,270 |
| 2010 | $240,074 | 1 | $240,074 |
| 2008 | $155,612 | 2 | $77,806 |
| 2006 | $93,429 | 1 | $93,429 |
| 2004 | $60,764 | 2 | $30,382 |
| 2002 | $70,181 | 4 | $17,545 |
| 2000 | $13,326 | 1 | $13,326 |
| Total | $757,239 | 15 | $50,483 |
