Washington (AFP) – US Supreme Court nominee Ketanji Brown Jackson vowed Monday to defend the “grand experiment of American democracy” as she launched a historic bid to be the first Black woman on the nation’s highest judicial bench. President Joe Biden’s pick made the pledge as she was formally introduced at the start of televised hearings that will go on to include two days of questioning and a final day of testimony from outside witnesses. “If I am confirmed, I commit to you that I will work productively to support and defend the Constitution and the grand experiment of American democracy t…