Clinton confidante: Sanders did 'significant damage'
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Longtime Hillary ClintonHillary Diane Rodham ClintonDershowitz to The Atlantic: Do not violate Constitution to safeguard it Why Joe Biden (or any moderate) cannot be nominated GOP Rep. Tom Marino resigns from Congress MORE confidante Neera Tanden in a new podcast commends Bernie SandersBernard (Bernie) SandersWomen's March plans 'Medicare for All' day of lobbying in DC Group aiming to draft Beto O’Rourke unveils first 2020 video Why Joe Biden (or any moderate) cannot be nominated 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 ObamaBarack Obama wishes Michelle a happy birthday: 'You’re one of a kind' NY Times prints special section featuring women of the 116th Congress Former congressmen, RNC members appointed to Trump administration roles 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."