The expulsion of Jeremy Corbyn from England’s Labor Party after he pledged to stand as an Independent for his longtime district, is a moment to celebrate. His banisher is the party’s leader, Sir Keir Starmer, who hopes to end 14 years of Tory rule when the country goes to the polls on, of all days, July 4. Now comes Mr. Starmer to renew his intention to “tear antisemitism out of our party by the roots.” President Biden, call your speechwriter.