By Daniel Wiessner (Reuters) – A judge seen as a leading contender to be nominated by President Joe Biden to the U.S. Supreme Court penned her first ruling as an appeals court judge on Tuesday, striking down a policy begun under former President Donald Trump that had restricted the bargaining power of federal-sector labor unions. Judge Ketanji Brown Jackson of the U.S. Court of Appeals for the District of Columbia Circuit wrote that a federal labor board failed to explain its abrupt departure in 2020 from decades of precedent when it limited government agencies’ obligations to bargain with uni…