Mashantucket — Danbury Mayor Mark Boughton won the Republican endorsement for governor Saturday, emerging as the choice of GOP delegates from a field of eight candidates on the third ballot. But he faces a primary in August, most probably with five candidates, including two wealthy businessmen who bypassed the state convention. 

It was an emotional victory for the 54-year-old Boughton, whose gubernatorial ambitions fell woefully short in 2010 and 2014, prompting doubts he could win statewide. More recently, Boughton had to overcome concerns about his health: He had delicate surgery last year to remove a non-cancerous brain tumor and had a seizure while campaigning in March. 

“First of all,” Boughton told delegates, “I’m grateful to be alive.” 

With the vote for lieutenant governor to follow, Boughton was brief in his remarks, offering thanks and a plea for the party to come together as it tries to recapture an office held by a Democrat, Gov. Dannel P. Malloy, for eight years. The GOP previously held the office for 16 years. 

“The time is now for Republican leadership and Republican ideas and values and to make this state the place that all of us remember being,” Boughton said, accepting the endorsement. “I am committed to do that. Let’s get out and vote.”  

State Sen. Joe Markley of Southington won a first-ballot victory for lieutenant governor in a four-way race with First Selectman Jayme Stevenson of Darien, First Selectman Steven Everett of Columbia and New Britain Mayor Erin Stewart, who quit the gubernatorial race Friday. All but Everett qualified for a primary. 

The path to victory was twisting for Boughton, and he has significant challenges ahead. On Saturday, more than 1,150 delegates gathered at Foxwoods Resorts Casino for a political game of “Survivor!” With eight candidates seeking the endorsement, the rules were established to eliminate contenders on each round of balloting. 

Candidates had to reach 8 percent on the first ballot to continue to the second round, when the threshold rose to 15 percent. Delegates eliminated five of the eight candidates on two ballots Saturday, setting up a third-round face-off between Boughton, former First Selectman Tim Herbst of Trumbull and the day’s surprise, Steve Obsitnik of Westport. 

It ended with Boughton winning with 50.14 percent of the vote, to 40.86 percent for Herbst and 9 percent for Obsitnik, whose high point of nearly 18 percent came on the second ballot. Obsitnik informally released his delegates on the final ballot, letting the convention make an endorsement without a fourth round of voting. 

On the first ballot, delegates gave Boughton and Herbst sufficient votes to qualify for a primary, eliminated Prasad Srinivasan and Mike Handler, and left four others scrambling to find new support before votes were cast on a second ballot.

Qualifying for a primary requires 15 percent on any one ballot. Boughton garnered 24.45 percent on the first ballot, trailed by Herbst at 18.8 percent. On the bubble for the second ballot were Peter Lumaj at 14.74 percent, Shelton Mayor Mark Lauretti at 10.50 percent, Obsitnik at 10.33 percent, and Dave Walker at 9.18 percent. 

Candidates who fell below 15 percent on the second ballot were eliminated. The cutoff for the first ballot was 8 percent. Srinivasan, a state lawmaker from Glastonbury who jumped into the race a year ago, came painfully close, with 7.94 percent. Handler, the chief financial officer of Stamford, had 4.06 percent. (He may petition for a primary.) 

On the second ballot, Boughton, Herbst and Obsitnik were the only candidates to clear 15 percent before vote switching began. Under the convention rules, every delegation had the right to switch its votes before the tally was finalized. The final was: Boughton, 36.27 percent; Herbst, 28.36 percent; Obsitnik, 17.6 percent; Lumaj, 14.31 percent; Lauretti, 2.31 percent; and Walker, 1.16 percent. 

Obsitnik, a tech entrepreneur, Annapolis graduate and former submariner, surged from the pack, ending up as the second choice of delegates who wanted to see a businessman in the mix with two candidates with electoral experience, Boughton and Herbst. 

“We’re picking people for a primary. I think what the delegates are saying is we don’t want to just have politicians on that primary ballot,” Obsitnik said. “We also want to have some business folks with relevant experience, and I think that’s the story — they want choice.” 

Two other well-financed candidates, David Stemerman and Bob Stefanowski, are bypassing the convention and plan to petition for a place on the primary ballot. If they succeed, Republicans will go to the polls in August in a primary with five candidates: Boughton, Herbst, Obsitnik, Stemerman and Stefanowski. 

Many delegates didn’t make their choices until arriving at the gambling resort on Saturday, when they weighed the collective strengths and weaknesses of the candidates — particularly Boughton and Herbst. 

Sen. John A. Kissel of Enfield, a superdelegate by virtue of his office, committed to Herbst just before leaving the convention hall for lunch, a chore that meant exiting the convention hall for the bells and whistles of the gaming floor. 

Herbst’s pugnacious personality, a concern for some, was a decided plus for Kissel. 

“I think he’ll be a tough campaigner. I think that’s what we need,” Kissel said. “I think that’s who we need to win the race.” 

On the second ballot, Rep. William A. Petit Jr. of Plainville, who voted for Srinivasan in the first round, said the delegates from his community debated whether to help more candidates get to 15 percent — or focus on getting one to 50 percent. 

The Boughton campaign seemed to pick up momentum earlier Saturday, something that many political operatives say is more myth than reality in a primary, but palpably real in the confines of a convention hall, where the only topic is politics, and the only currency is information. 

“You can feel it at a convention,” said William Hamzy, a former state chairman and state legislator, now a delegate from Thomaston. “To me, the question is who is the most electable candidate.” 

Caleb Espinosa of Montville, one of the youngest delegates at age 18, said he was supporting Boughton, a long-time mayor of a city with low unemployment and a strong economy, on the issue of competence. 

“He’s dealt with a lot of issues that Connecticut’s dealing with, and he’s been a mayor for quite some time now,” he said. “He ran as lieutenant governor in 2010, so he has some experience running as a nominee for a statewide position already, and there’s a lot of people he could resonate with — especially being the mayor of a city that’s pretty big.” 

Alice Lehr, 81, of North Branford said she liked Lumaj, admiring his immigrant story of coming to the U.S. from communist Albania. 

“He went through a lot to come to this country, and he came over here to the United States and he educated himself, he started his own business, he has a nice family and he understands what the state needs,” Lehr said. “And because of his experience through his life and also his experience in his business practice, I think he understands what we need in this state. We need someone who can handle a budget, pass laws that will protect everyone and not be a sanctuary city.”