By Patricia Zengerle and Richard Cowan WASHINGTON (Reuters) -U.S. state election officials on Tuesday recounted how supporters of Donald Trump threatened, insulted and harassed them, sometimes turning up at their homes, after they refused to help the former president overturn his 2020 election defeat. The congressional committee investigating the deadly Jan 6, 2021, attack on the Capitol by Trump supporters heard how a flood of calls and emails paralyzed operations of the Arizona House of Representatives speaker’s office. “We received … in excess of 20,000 emails and tens of thousands of voi…

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