Senate Democrats made a mistake when they eliminated the filibuster for lower court judges in 2013. They’re making the same mistake again — except this time with a far less certain payoff. Vice President Kamala Harris said Tuesday that she favors lowering the existing 60-vote threshold to a bare majority to enact legislation to protect abortion rights nationwide. “I think we should eliminate the filibuster for Roe and get us to the point where 51 votes would be what...