Donna Brazile called the emails "very mean-spirited."
"This campaign is not just about electing a president," he told supporters.
Actress Rosario Dawson criticized Clinton at a delegate powwow.
"I am interested in bringing everybody together."
Naomi Jagoda 07/25/16 11:58 AM EDT
Republican Todd Young has called Social Security a "Ponzi scheme," according to the DSCC ad.
Sanders will address “how we are stronger together,” an official said.
Polling suggests many Sanders backers find Kaine unacceptable.
The chants reverberated throughout the Republican National Convention last week.
The last time Trump led Clinton in the RealClearPolitics average was in May.