Barack and Michelle Obama have cast Kamala Harris as the heir to their political movement and flipped the script on Donald Trump, former Obama adviser David Axelrod told the Guardian on Wednesday.

The Obamas delivered electrifying speeches at the Democratic national convention in Chicago on Tuesday night. The former US president compared Harris’s ascent to his own by observing: “I’m feeling hopeful because this convention has always been pretty good to kids with funny names who believe in a country where anything is possible.”

Michelle, the former first lady, invoked her husband’s hope-and-change campaign by remarking: “Something wonderfully magical is in the air, isn’t it?… A familiar feeling that’s been buried too deep for too long. You know what I’m talking about? It’s the contagious power of hope.”

Both addresses were lauded by Axelrod, chief strategist for the 2008 and 2012 Obama presidential campaigns, in an interview after an event organised by the University of Chicago Institute of Politics and the Cook Political Report on the sidelines of the convention.

He said: “When Barack Obama got the call in 2004 that he was going to give the keynote speech at the Democratic convention, he said immediately, I know what I want to say, I want to talk about my story as part of the larger American story, and he’s always done that. He and Michelle are great American stories and they take pride in that and the values associated with that.

“You heard it last night and Kamala Harris is very much rolling down those same tracks. They flipped the script on Trump. Trump’s play is to try and make people alien and what they did was make Trump alien to the values that most Americans share, so I thought those speeches were incredibly effective.”

Axelrod, a former senior adviser to Obama in the White House, said there was “no doubt” that the Obamas regard Harris as their natural heir.

“I think they feel very much a kinship with Harris and they see her as carrying that torch forward of what America really is about: the time-honored values of community and selflessness and hard work and all the things that we like to associate with what it means to be an American. She is out there talking about that and it’s one of the reasons why she is right in the middle of this race.”

The mood in Chicago has been buoyant, with fears of a repeat of the party’s chaotic 1968 convention in the same city evaporating: instead of division and acrimony there is unity and joy. The gloom around Joe Biden’s candidacy has lifted as opinion polls show Harris pulling narrowly ahead of the Republican nominee Trump in swing states. Can it last?

Axelrod, who was a student in Chicago and has spent much of his career in the city, commented: “I don’t know how you measure when honeymoons end but here’s the reality of the situation. This turnover happened very late in the race. She has had a very good month not just because of a honeymoon, but because of the way she’s presented herself, the way her campaign has positioned her. She now has a convention, which is a four-day commercial.

“You get to Labor Day because next week is sort of a dead week and then the following week you have the debate. If she does reasonably well in the debate that takes you into late September and people are already voting. I think she has the ability to extend this and it may just turn out that it’s not a honeymoon but the consolidation of the base and then it becomes a scrum for the remaining voters.”

As the Obamas define Harris as a personification of American values, Trump has been struggling to land a counter-punch. He has sampled attacks on her racial identity and intelligence as well as peculiar nicknames such as “Laffin’ Kamala”, “Lyin’ Kamala” and “Kamabla”. Axelrod believes that the former president is flailing.

“He’s a jazz man when it comes to all of this and he gets in front of a crowd and he tries to find the groove and he throws everything against the wall. It’s generally bile, it’s personal and it’s negative. But he’s just trying out themes. The campaign seems more rational than the candidate and that’s been true from the beginning. The question is whether they can get him under control and on the message.

“The best chance is for them to try and make her sort of Biden-lite and make her wear the jacket for whatever it is that people are unhappy with about Biden’s policies. But it’s hard to get people to buy the idea that the vice-president was actually pulling all the strings. That’s the flip side of nobody really knowing much about her. I don’t think they believe that and so there aren’t that many good options for that.”

But he warned: “That’s not to say this isn’t a really close race and I’m not sure, if the race were today, that Trump wouldn’t win. But the motion is certainly in her direction.”

Asked by the Guardian for a final prediction, Axelrod shot back: “Are you nuts? My prediction is it’s going to be a very close race. And I would not have made that prediction a month ago.”