Republican Brian J. Herr, a Hopkinton selectman, said today he was running for US Senate, hoping to unseat Democrat Edward J. Markey this November.

In a statement, he said he was running “because I believe the key to putting America back on track is to elect leaders that approach problem solving with an open mind and a strong background in the private sector.”

In an interview with the Globe earlier this month, Herr indicated he would focus his campaign on bringing leadership to a gridlocked Washington. He said he hoped to make government run more like a business.

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Herr, an account executive who works in technical sales in the commercial construction industry, said he supports gay marriage, abortion rights and the Second Amendment.

A spokesman for Herr said the 51-year-old was filing official paperwork for the run with the Federal Election Commission today.

Markey won a special election in June to complete John F. Kerry’s term. Kerry had resigned to become secretary of state. Markey beat GOP nominee Gabriel E. Gomez by 10 points.

Gomez has said he is not running this year. Prior to Herr’s announcement, Markey did not have an opponent.

Speaking to media in Pittsfield on Sunday, Markey said his re-election campaign would be focused on jobs, income inequality, and access to opportunity for everyone.