There seems to be some confusion on this issue so let me clarify:
DO… Act like you need the Bernie voters, because you do. Sure Hillary has won 60% of the vote, congrats! But remember the other 40%? Good luck winning the general without them.
DO NOT… Dismiss Bernie voters as “cultists”, “purists”, “gullible youngsters” or “out of touch liberals”. If you find yourself explaining how you’re right because you’re “older and wiser”, JUST STOP. It’s patronizing and not any more true than the generalizations that were made about the Hillary coalition. Remember that freak-out? Yeah, it’s a two-way street.
DO… Address issues specifically and in a way that pulls Hillary to the left. This is what motivates the left wing of the party. You may be surprised to find that no one was voting for Bernie because of his personality. We liked his positions on the issues and his integrity to follow through with those positions.
DO NOT… Attemp to revise history and pretend that the above does not need to be done with Hillary. Yes, she needs to be pressured on TPP as she has only recently “evolved” to her current opposition. Yes, she needs leftward pressure to moderate her interventionist foreign policy tendencies. Etc, etc. She is not as liberal as Bernie, and misrepresentations otherwise will go over as well as a lead balloon.
DO… Realize that the only thing that has occurred here is that more people went into a voting booth and pulled the “Hillary” lever instead of the “Bernie” lever. A political win is not the same things as being right on the issues in reality. If global warming renders large sections of the planet as uninhabitable wastelands, supporting fracking, for instance, will have been objectively the wrong policy. If you find yourself arguing that some view or another of Hillary’s is the right view because she won the nomination, JUST STOP.
DO NOT… Tell us about her warm personality or how charming she is in person. Again, we were voting for a grumpy old guy from Vermont who winds up yelling about banks at the end of most speeches. She could give her nomination speech in Klingon and then flip off everyone at the convention for all I care. As long as she stays true to the liberal positions she’s been pushed to adopt, that’s all that matters.
DO… Focus on the Supreme court openings. Most of the overlap in interest between the two wings begins there, no one wants another Scalia.
DO NOT… Make lists projecting the things you care about as if that’s suddenly going to win over the Bernie wing. If the normal Clinton “rah-rah” hasn’t won over Bernie supporters by now, another list of the same old isn’t suddenly going to win over converts. Listen to what the Bernie wing has to say, find out what they care about, and then act to support those concerns.