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Thomas Charles O'Halleran is an American politician who served as the U.S. representative for Arizona's 1st congressional district from 2017 to 2023. Beginning his political career as a Republican, he was the Arizona state senator from the 1st district from 2007 to 2009. In 2015, he became a member of the Democratic Party. He also served as the chair of communications for the Blue Dog Coalition. On June 7, 2023, he was appointed as a senior advisor to the U.S. Department of Agriculture in the Joe Biden administration. Wikipedia