Question: The man who succeeded John Robert Marks as Mayor of Tallahassee in 2014 has declared his candidacy for which position in the 2018 election?

Context articles: John Marks (mayor)
Charles A. Cook
Mick Cornett
Toronto mayoral election, 2018
María Meléndez
Marinus II of Gaeta
Gary Johnson presidential campaign, 2012
Jiří Drahoš
Andrew Gillum
Texas's 8th congressional district

John Robert Marks III (born July 25, 1947) is an American lawyer, politician, and former Mayor of Tallahassee, Florida from February 2003 until November 2014.
 Marks is the longest serving mayor in Tallahassee's history.
 He was elected to three consecutive terms as the city's Mayor, spanning nearly twelve years.
 He won a third term in 2010, but declined to seek re-election for a fourth term in 2014.
 He was succeeded by Andrew Gillum on November 21, 2014.
Charles A. Cook (died 18 March 1878) In Dec 6, 1859 he sold one half of original share in Town of Highland (share No. 22), drawn by George C. Nelson, etc.
 Later, he was the second mayor of Denver, Colorado, serving from 1861, when Denver was incorporated into Kansas Territory until 1863.
 He succeeded John C. Moore, who served as mayor 1859-61 when Denver was part of the Jefferson territory.
 He died on 18 March 1878 while visiting Hot Springs, Arkansas to improve his faltering health.
 His remains were returned to Colorado where he was buried in Denver's Riverside Cemetery on 23 March 1878.
Michael Earl "Mick" Cornett Sr. (born July 16, 1958) is the 36th and current mayor of Oklahoma City since 2004.
 A member of the Republican Party, he is only the fourth mayor in Oklahoma City history to be elected to three terms and the first to be elected to four terms.
 He also serves as President of The United States Conference of Mayors and served as national President of the Republican Mayors and Local Officials (RMLO).
 U.S. Conference of Mayors.
 He also served as Chairman of the U.S. Conference of Mayors Urban Economic Affairs Committee until 2007.
 He is currently running for the Republican nomination for Oklahoma governor in the 2018 election.
The Toronto mayoral election, 2018 is scheduled for October 2018.
 The election will elect a new candidate, or re-elect John Tory as the mayor of the City of Toronto.
 Incumbent John Tory is expected to run for re-election.
 Doug Ford, 2014 mayoral election candidate and the brother of former mayor Rob Ford will be running against Tory in the 2018 election.
María Eloisa Meléndez Altieri (born 1950), also known as Mayita, is the current mayor of the city of Ponce, Puerto Rico.
 She was elected during the Puerto Rican general elections of 2008, becoming the first woman elected to the office in Ponce's political history.
 She is also the first mayor of a party other than the Popular Democratic Party in Ponce since 1989, when Rafael Cordero Santiago became mayor.
 This is Mayita's second candidacy in politics on the island and her first electoral win.
 In the Puerto Rico's 2004 general election, Mayita presented her candidacy for a senatorial seat representing Puerto Rico's 5th district, but lost in her bid for the position.
Marinus II was the son of Docibilis II of Gaeta and Orania of Naples.
 He was made "dux" of Fondi by his father and his elder brother John II recognised this title.
 After his brother Gregory, who succeeded John, died, Marinus succeeded to the duchy of Gaeta and gave Fondi to his son Marinus.
 He was succeeded by his son John III and is the father of the Caetani family.
The 2012 presidential campaign of Gary Johnson, the 29th Governor of New Mexico, was announced on April 21, 2011.
 He declared his candidacy for the 2012 Republican Party nomination for President of the United States.
 On December 28, 2011, Johnson withdrew his candidacy for the Republican nomination, and declared his candidacy for the 2012 presidential nomination of the Libertarian Party.
 The 2012 Libertarian National Convention was held during the first weekend of May 2012.
 On May 5, 2012, after promoting his libertarian-oriented political positions to delegates, Johnson received the most votes at the convention and became the official 2012 Libertarian presidential nominee.
 On November 6, 2012, Johnson received just under 1% of the popular vote in the general election, amounting to more than 1.2 million votes, more than double what the Barr/Root ticket received in 2008.
 This was the most successful result for a third-party presidential candidacy since 2000, and the best in the Libertarian Party's history by vote number at the time.
 (Johnson ran again in 2016 and received nearly four times his 2012 vote total.)
Jiří Drahoš (born February 20, 1949) is a Czech physical chemist and politician who served as President of the Czech Academy of Sciences from 2009 to 2017.
 In March 2017, Drahoš announced his candidacy for President of the Czech Republic in the 2018 election.
Andrew D. Gillum (born July 26, 1979) is an American politician who serves as the mayor and formerly served as a city commissioner of Tallahassee, Florida.
 At the age of 23, Gillum became the youngest person ever elected to the Tallahassee City Commission in February 2003.
 Gillum has declared his candidacy for Governor of Florida in the 2018 election.
Texas District 8 of the United States House of Representatives is a Congressional district that includes Montgomery County and Walker County.
 It includes much of the northern outlying areas of metro Houston.
 The current Representative from District 8 is Kevin Brady and has been since 1997.
 For the 2014 election cycle Craig McMichael, a veteran of the Marine Corps, and network engineer had challenged and lost to incumbent Kevin Brady in the Republican Primary.
 In the 2014 General Election, Brady faced off against the Libertarian Party candidate, Ken Petty of Spring, Texas, who won his nomination in the Libertarian District Convention.
 No Democrat ran.
 In the 2016 election, the 20-year incumbent was challenged by 3 challengers: Andre Dean, Craig McMichael, and Steve Toth.
 As of August 2017, Brady is expected to face Democrat Steven David in the 2018 election as well as Independent candidate Todd Carlton.
 David is the first Democrat to challenge Brady since the 2012 election.