Gatsas first was elected mayor of Manchester, New Hampshire in 2009, defeating Democrat Mark Roy in the nonpartisan election 10,668 to 8,128. Gatsas won a huge victory over Chris Hebert in the 2011 mayoral contest, taking nearly 70% of the vote. In 2013, Gatsas was again re-elected, defeating Patrick Arnold, but by less than 1,000 votes. In 2015, Gatsas faced his stiffest challenge ever, when he beat Democratic Alderwoman Joyce Craig by only 64 votes, after a recount. In a 2017 rematch, Craig defeated Gatsas, 53% to 47%, thus becoming the first woman to serve as Mayor of Manchester.
2016 New Hampshire gubernatorial race
Ted Gatsas entered the race for the Republican Party nomination for Governor of New Hampshire. Having never lost an election, Gatsas was seen as a strong contender in the field, but came in third behind eventual victor Chris Sununu and the relatively unknown State Representative Frank Edelblut in the five-person field. Gatsas won slightly more than 1,000 votes more than fourth-place finisher Jeanie Forrester. Gatsas lost in every city and town in New Hampshire except for Manchester and the Manchester suburbs Goffstown and Hooksett. A year after his loss, he had to personally repay $68,000 to his campaign contributors due to finance law irregularities. The contest between Gatsas and Sununu was bitter. When filing for his campaign bid, Sununu accused the Manchester Police Department of failing to adequately fight the drug crisis, which drew a stern rebuke from Manchester Police ChiefNick Willard. Gatsas called on Sununu to apologize.
In June 2017, it was revealed that the rape of a 14-year-old girl had occurred at the city's West High School in September 2015. A public uproar ensued when it became apparent that neither the county district attorney, City Hall, the police department or the Manchester school system had reported the rape of the girl to the public. When Joyce Craig criticized Gatsas's handling of the 2015 rape, he accused her of trying to politicize the crime. Then-Mayor Gatsas first told the New Hampshire Union Leader newspaper that "we were not told a rape occurred at West". Gatsas subsequently claimed he was not told of the "severity" of the incident and emails released from a school district employee show that Gatsas was informed of a "sexual assault" at the school. It came to light that the School Board, City Hall, and the Police Department considered it the job of another department to inform the public. The revelation of the rape and the failure to inform the public of the crime led to changes in police and school administration policy.
Gatsas was criticized for not revealing that the rape had occurred, and accused of not revealing the crime as he was in a tough reelection battle. Records show Gatsas subsequently sued two political activists, one of which chaired Joyce Craig's previous run for Mayor, who accused him of covering up the rape for political advantage. The lawsuit was dismissed after Mayor Gatsas lost the election.
Domestic violence prosecution
It was found in the final days of the Gatsas administration that the City Solicitor's office had failed to successfully prosecute domestic violence cases. The City Solicitor, Tom Clark, was appointed by the Board of Aldermen in 1995, well before Gatsas became mayor, and had been reappointed by the Board of Aldermen multiple times. Police Chief Nick Willard, who had figured in the high school rape controversy, appealed directly to the Attorney General of New Hampshire for help. The chairman of the Board of Aldermen, Pat Long, said "As an elected official I feel a sense of responsibility". The Manchester police department helps in the prosecution of domestic violence cases. The scandal led to the early retirements of city prosecutors and the temporary take-over of the department by the state. A stand-out in the battle against opiates who had attracted national attention, Chief Willard, subsequently was named U.S. Marshal by President Donald Trump.
Executive Council
In March 2018, Ted Gatsas announced his bid for the office of Executive Councillor from District Four. Gatsas won the Republican nomination by beating Jane Cormier. Gatsas narrowly defeated Democrat Gray Chynoweth in the general election, claiming 48.9% of the vote to Chynoweth's 47.4%.