By Gram Slattery WASHINGTON (Reuters) -North Carolina officials have registered 14 instances of potential intimidation or interference with voters and election workers in the run-up to Tuesday’s U.S. midterm elections, according to records provided to Reuters on Friday. The alleged incidents come as grassroots poll observers, many recruited by prominent Republican Party figures and activists, fan out in the lead-up to Tuesday’s vote, a trend that has worried experts and officials. Many of the activists have embraced false conspiracy theories, spread by former President Donald Trump, which hold…