Alabama's famed Ten Commandments judge, Roy Moore, has forced a Senate primary runoff with president-backed incumbent Sen. Luther Strange, setting up a September showdown that could be closely watched for clues about Republicans' prospects in 2018 midterm elections. Moore, who has twice been stripped of chief justice duties for stands over the Ten Commandments and against gay marriage, rode a tide of anti-Washington sentiment and his fame as an icon of the culture wars to lead the first round of voting and secure a runoff spot.