PHILADELPHIA — The staff at the Democratic National Convention is very good at handing out props. Is Michelle Obama about to speak? Hand out the big cardboard sticks with MICHELLE in vertical letters. Is Meryl Streep about to congratulate the audience on making history? Make sure everybody has a HISTORY sign. Did anyone say STRONGER TOGETHER? Of course there’s a sign for that. And is Bill Clinton about to attempt to sell his wife, in national office or the national spotlight for a quarter-century, as a “change maker”? Distribute the CHANGE MAKER signs.

But convincing voters that Hillary Clinton is a CHANGE MAKER could be a lot harder than handing out placards.