Biden can help Harris win now---the popularity of his policies still matters.

Logistically, Biden would likely be deployed in ways that could maximize his strengths and allow Harris to expand her voter base.

Democrats boasted that he could appeal to working-class voters, seniors and independents -- all demographics he performed well with in 2020 who would need to be kept in the fold as Harris regains ground with younger voters and voters of color who were drifting away from Biden

Vice President Kamala Harris delivers the keynote speech at the American Federation of Teachers' 88t...Show more

Brendan Smialowski/AFP via Getty Images

"He can help in the Midwest, some of the blue-collar workers, some of the places where he's got a unique relationship to those voters with the 'Scranton Joe' kind of thing. And older voters love him," said the strategist with ties to Harris' team.

Biden also retains goodwill "among a lot of independents and even moderate Republicans who may have questioned his age but not his ability and his sincerity," Jones argued.

For his part, Biden has indicated he's ready to campaign for Harris. And while the campaign did not specify how he'll be deployed, spokesperson Lauren Hitt told ABC News in a statement the president will be "an effective advocate for the Vice President on the campaign trail."

"My expectation is that he will play whatever role the vice president asks him," said Mitch Landrieu, the former New Orleans mayor and Biden administration official.

"Everything and anything, any and all, repeat and rinse," Landrieu added when asked exactly what that looks like. "The president's going to be in it to win it for her."