Giving in to the impulse to demonize Clinton — which Sanders has creditably not done — will only make it harder for the party to come together to defeat the actual enemy in November. That enemy, for Democrats, will be the GOP standard-bearer who will have promised to get rid of Obamacare, block any pathway to citizenship for undocumented immigrants, continue efforts to erode abortion rights, keep taxes low on the rich, appoint conservative federal judges and Supreme Court justices and so on.