The chairman of Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE’s presidential campaign says Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) has reneged on his pledge not to engage in negative political attacks.

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John Podesta said Sanders went on the offensive against Clinton in his speech at the Iowa Democratic Party’s Jefferson-Jackson Dinner on Saturday.

“I think Bernie Sanders seemed to have a course correction in the dinner from one in which he said he wasn’t going to go negative to — to obviously focusing his, you know, his fire on her,” Podesta said on ABC’s “This Week” on Sunday.

Podesta said Clinton, on the other hand, refrained from partisanship and focused on painting a positive vision for the future of America in her speech.

“I think she’s looking to the future,” he said. “I think her speech last night really put forward a positive vision of where the country can be.”

Clinton appeared to accuse Sanders of sexism in her speech at the dinner.

She said she was told to stop “shouting about gun violence,” quoting Sanders.

“Well, first of all, I’m not shouting. It’s just when women talk some people think we’re shouting,” Clinton said.

Sanders is disputing that allegation.