WASHINGTON – Mitt Romney isn’t the only Massachusetts resident to recently clinch his party’s nomination for president.

Jill Stein – a Lexington resident who actually has experience debating Romney before a televised audience – on Tuesday in California secured the delegates needed to win the Green Party nomination.

One of her chief rivals for the nomination was comedian Roseanne Barr.

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“Voters will not be forced to choose between two servants of Wall Street in the upcoming election,” Stein said in a statement on Wednesday. “Now we know there will be a third candidate on the ballot who is a genuine champion of working people.”

Stein, a graduate of Harvard and Harvard Medical School, ran for governor in 2002 and participated in debates with Romney. She received a surprising 3.5 percent of the vote, which wasn’t enough to change the outcome. But she participated in several statewide debates with Romney, rarely shirking from criticizing the future governor but not always making an imprint.

During one, Romney turned directly toward Stein and said, “Carla, I agree…” before correcting himself. “I’m sorry, I’m sorry. Excuse me, Dr. Stein.” (He apparently mistook her for Carla Howell, a Libertarian in the race.) 

Stein is a suburban mother and doctor who became a public health and political activist and has been running for various offices since 2002 (2004 as state representative, 2006 as secretary of state, 2010 for governor).

She’s expected to become the formal nominee of the Green Party at their convention next month in Baltimore.