Few specifics about the speech have been released in advance, but some aides have given some insight into the address.
Clinton campaign manager Robby Mook said that she will “weave” the themes that have been touted during the convention — how America is “United together” and “Working together” and how Clinton has had “A lifetime of fighting for children and families.” Tonight’s theme, “Stronger together,” has been a maxim of her campaign.
“Tonight in her speech Hillary is going to stitch together each of these themes and talk about how this election is really a moment of reckoning for the voters,” Mook said at a briefing this morning.
Clinton sought ideas for this speech from some of her former speechwriters and senior policy adviser Jake Sullivan, but it was Dan Schwerin, Clinton’s current head speechwriter, who took the lead.
“She should reassure them that she has heard them and their concerns and that she will be a tireless advocate” for causes that were important to the Sanders campaign, Campbell told ABC News.
“She must not only unify the party but excite it, invigorate it,” he added.
When it comes to her shortcomings, Campbell said there is a way to turn them into advantages.
“Everyone knows that she has a great deal of experience, but they also know that she has left a long trail of controversies in her wake,” he said.
“She should emphasize that her experience is not just a series of entries on her resume but that she has learned about policy and about her own strengths and weaknesses through this experience. Experience is not a virtue on its own, but it is an opportunity to learn,” he said.
Tonight won’t be Clinton’s first appearance at the convention — she spoke via video on Tuesday after her husband’s speech and she walked onstage to thank President Barack Obama after his speech last night — but it will be the first time she formally addresses the attendees in person.
While the bar is undeniably high for Clinton tonight after the string of speeches that have been given this week, Campbell doesn’t think that she will be held to the same standards.
ABC News’ Ann Compton, Liz Kreutz, Alana Abramson and Corinne Cathcart contributed to this report.