Clinton confidante: Sanders did 'significant damage'
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Longtime Hillary ClintonHillary Diane Rodham ClintonDems flip New York state seat that Republicans have held for nearly four decades Dems win majority in New York Senate, but won't control it Chelsea Clinton hits back at NYT reporter over details in new book MORE confidante Neera Tanden in a new podcast commends Bernie SandersBernard (Bernie) SandersWebb: Bernie Sanders announces his ‘new’ communism jobs, health-care plan A new progressive standard on campaign cash: It can't come from corporations Senate Health panel approves opioid bill MORE for the issues he raised during his campaign but notes his attacks on the Democratic presidential nominee were harmful.

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“I actually have to say, I think he brought a lot of really important issues to the floor, but Senator Sanders was prosecuting a much tougher character attack” than Barack ObamaBarack Hussein ObamaDems flip New York state seat that Republicans have held for nearly four decades Trump denies clemency to 180 people Mellman: Memories may be beautiful, yet… MORE did in 2008, Tanden said during Politico’s “Off Message” podcast.

“He did do significant damage to Hillary's negatives."

During the primary season, the Vermont senator often attacked the eventual Democratic nominee on the campaign trail — at points, questioning her judgment.

“I mean, he drove a lot of those negatives, and the truth of it, I mean, just to be candid — or honest about it, I think getting those kinds of attacks from another Democrat or another liberal or another progressive is much tougher for Hillary," said Tanden, who is the president of the liberal think tank Center for American Progress.

"If you look at her trust numbers the last six months of that primary ... those numbers took a much sharper dive and [were] hard to recover from.”

Sanders endorsed Clinton ahead of the Democratic National Convention, vowing to help the Democratic nominee win the presidency.

But Tanden, who supported Clinton's shift to the left due in part to Sanders's criticism, said the Vermont senator may have let the primary stretch out too long.

"The primary was much tougher [than 2008]," she said.

"There were many more open attacks on being 'bought and paid for' and all that stuff."