The president has described his mood as "fired up" about talking with voters, adding that he "cannot wait to get out there and campaign for Hillary."
Obama is expected to campaign quite a bit for Clinton, particularly in the fall, and brings a unique perspective, having competed against her in the 2008 primary before working closely with her as his secretary of state.
"The president has had to opportunity to watch Secretary Clinton perform up close and he’s seen her tenacity, her dedication, her commitment to a set of principles that they share. And that’s why the president is quite enthusiastic about her campaign," White House Press Secretary Josh Earnest said earlier this month after Obama's endorsement of Clinton released in a video.
But campaigning for Clinton is about much more than educating voters about the president’s admiration for the candidate, according to Michael O'Hanlon, a senior fellow at the Brookings Institution.
It's also about protecting his own legacy.
"If Obama sees Hillary in danger of losing and feels he can do something about it, he will leave no stone unturned, partly for her, but much more so for his own legacy."
In Charlotte, North Carolina, Tuesday, Clinton's campaign says, the two will "discuss the progress that's been made" and "their vision for an America that is stronger together."
It's safe to assume the president will also repeat how qualified he thinks Clinton is for the job, while hitting Trump as he already has over the course of the primary.
"I know Hillary will be so good at it,” Obama said in his endorsement video. “In fact, I don't think there's ever been someone so qualified to hold this office. She's got the courage, the compassion and the heart to get the job done.”