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PHILADELPHIA — Democrats are perhaps encountering more opposition than they planned with Bernie Sanders supporters at the national convention.

On opening night, Sanders delegates refused to clap during major speeches — even interrupting Sanders’ speech with boos.

“Bernie supporters are very angry right now,” said Jordan Ochoa, a Sanders supporter who helped run his campaign in Denver. “The Democratic Party betrayed all of us pretty much.”

Ochoa has yet to commit to voting for Hillary Clinton in November, an example of how bitter the campaign has become.

One former Denver politician, Wellington Webb, is working to unite the two sides, especially over the issue of superdelegates. Sanders’ Colorado supporters have repeatedly said superdelegates prevented the Sanders campaign from gaining momentum.

For instance in Colorado, even though Sanders won on Super Tuesday by 20 points, Clinton received all of the state’s superdelegates.

“We believe its a legitimate issue we have to look at it with the super delegates,” said Webb, the former mayor of Denver and a Clinton supporter.

Webb has message for the Sanders supporters on the importance of uniting.

“I know what it feels like to win, I know what it feels like to lose,” he said. “But we are a family.”