Swift, 36, announced her selection of Patrick C. Guerriero, 33, on Thursday, and dismissed questions about their youthfulness and disagreement over gay marriage.
"It is a great challenge to be your running mate and I accept it," Guerriero said.
Guerriero will challenge millionaire James Rappaport, the former state GOP chairman and the only declared Republican candidate for lieutenant governor, in the September primary.
Swift had publicly stated she does not want to run with the more conservative Rappaport, citing personality differences. She took a jab at him at Thursday's news conference, saying she was happy to be running with someone who never lost an election. Rappaport was defeated by U.S. Sen. John Kerry in the 1990 race for Senate.
Rappaport said Guerriero was a "nice young fellow," but that he was the more experienced candidate.
Guerriero, an advocate for gay rights, works on the governor's staff as a liaison with municipal officials, and helped persuade Swift to delay cuts in local aid last year. He is also an established Republican, having served as mayor in the Boston suburb of Melrose and three terms in the state House.
Swift had been turned down by two other men, one a county sheriff, the other a district attorney, before picking Guerriero as her running mate.
On Thursday, Guerriero and Swift echoed the themes that will mark their campaign - lowering taxes and strengthening education. They said they agreed to disagree on the issue of gay marriage, which Guerriero supports and Swift opposes.
Candidates for lieutenant governor and governor technically do not run as a ticket in state primaries, but for the past decade, Republicans have teamed up for political and financial strength.
Swift became the state's first female governor after Paul Cellucci left office to become ambassador to Canada. Last year, Swift became the first governor in the nation to give birth while in office.
She is also the youngest U.S. governor, according to the Washington, D.C.-based National Governors Association.
Democratic political consultant Dan Payne said the youth of the GOP ticket would be a difficult obstacle.
"A 36-year-old acting governor with a 33-year-old running mate isn't adding a lot of experience," he said. "The kids are in charge."
But Swift said Guerriero's experience was more important than his age.
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