Gomez cast himself as the new face of the Republican Party, which has struggled to reach out to minority populations following the defeat last year of GOP presidential candidate and former Gov. Mitt Romney.
Gomez has introduced himself in Spanish in campaign ads and on the stump in a state where Hispanic voters are a small but growing slice of the population.
Sullivan, an early favorite among conservative Republicans, touted his law enforcement and national security background, having helped investigate the Sept. 11, 2001, terror attacks and the failed attempt to blow up an airliner using shoe bombs.
But Sullivan collected the smallest amount of campaign contributions of the three GOP candidates and was unable to run any statewide TV ads.
Winslow, a former judge from Norfolk who served as chief legal counsel in Romney's administration, finished third despite putting $150,000 of his own cash into the race.
While Gomez easily outraised his challengers he also loaned his campaign at least $600,000.
The campaign, the third U.S. Senate race in Massachusetts in the past four years, was marked in part by the relatively low voter turnout. That turnout was likely hampered by the April 15 bombing and the search for the bombers, which consumed the attention of residents across Massachusetts.
In the town of Wayland, in Markey's congressional district, voters trickled in to polling places.
Holly Zaitchik, a retired Boston University professor, said she voted for Markey because he's "he's done a terrific job of being there when anything important happens" in Washington.
Zaitchik also thought the marathon attack might discourage turnout among voters.
"There are a lot of people who are still down and not wanting to participate in things," she said. "It's disheartening."
Markey, who has served in the U.S. House since 1976, and Gomez will be on the June 25 special election ballot along with Richard Heos, an independent from Woburn.
Democratic Gov. Deval Patrick had named his former chief of staff, William "Mo" Cowan, to fill Kerry's seat on an interim basis until after the special election.