PHILADELPHIA — Supporters of Sen. Bernie SandersBernie SandersMcConnell warns Biden not to 'outsource' Supreme Court pick to 'radical left' Briahna Joy Gray discusses Pelosi's 2022 re-election announcement Ocasio-Cortez: Supporting Sinema challenge by someone like Gallego would be easy decision MORE (I-Vt.) broke out into boos on Monday at the mere mention of presumptive Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonThe Armageddon elections to come Poll: Trump leads 2024 Republican field with DeSantis in distant second The politics of 'mind control' MORE.

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Actress Rosario Dawson criticized Clinton at a delegate powwow where Sanders is set to take the stage.
 
Clinton, Dawson said, is "not a leader. She is a follower." 
 
"She follows public opinion on things. If we stay strong ... our revolution is dependent on your time, energy. Your blood, sweat and tears," she said. 
 
Dawson and rapper Killer Mike helped warm up the crowd before Sanders took the stage. The senator is set to address his delegates ahead of the formal start of the Democratic National Convention Monday afternoon. 
 
The crowd also booed when Dawson mentioned Democratic National Committee Chairwoman Debbie Wasserman Schultz, who is stepping down from her role later this week after leaked emails showed her making critical comments of Sanders and his campaign. 
 
Both celebrities focused on the future of what Sanders supporters call the "revolution." 
 
Killer Mike said: "This revolution is not for now; it is forever."