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Danbury Mayor Mark Boughton, a Republican serving his 10th term, will be Democratic Gov. Ned Lamont’s pick for Tax Commissioner, according to sources familiar with the decision.

Boughton, a former state representative who ran for governor three times, and is the longest-serving mayor in Danbury history, will go to work for a Democratic administration. Boughton is an outspoken Republican on social media.

He had a brain tumor removed in 2017. In 2018 on the campaign trail he collapsed at an Avon Republican Town Committee candidate event.

Boughton, who will need to be confirmed by the legislature, will replace an Acting Tax Commissioner John Biello who stepped in earlier this year when former Hamden Mayor Scott Jackson went to work for New Haven Mayor Justin Elicker.

Jackson, who served as head of the Sandy Hook Commission and then went on to become Labor Commissioner, replaced former Senate President Kevin Sullivan of West Hartford who left for a job in the private sector.