Clinton's running mate reiterates a vow she first made during her 2008 campaign.
In the Democratic National Committee emails released last week, no one came in for more disparagement than Stephen Bittel, a South Florida developer.
Sanders, who endorsed Clinton two weeks ago, seemed taken aback by the level of anger.
After a rally with Bill Clinton, the Democratic ticket will head to a part of the country where they may encounter Trump's base.
The Democratic nominee also picked up the tacking of a retired Marine general on Monday.
We're not in Cleveland anymore.
The chairwoman of the Democratic National Committee faced growing pressure to resign in the aftermath of the release of thousands of embarrassing internal email exchanges among Democratic officials. Her resignation takes effect at the end of the Democratic National Convention, which begins Monday. This is a developing story. It will be updated.
"We needed some prayers today, and we got some prayers, and we got some support, and it really feels good."