PHILADELPHIA — California delegation breakfasts are usually tepid affairs at the national political conventions — a parade of office holders and party officials droning on as the delegates half-listen while slugging down bacon, eggs and gooey rolls.

But Monday’s breakfast turned angry when delegates for Sen. Bernie Sanders booed nearly every mention of presumptive nominee Hillary Clinton’s name and nearly drowned out speakers including House Minority Leader Nancy Pelosi and California Secretary of State Alex Padilla.

The outbursts are an early sign of how Sanders’ supporters are going to continue to speak out loudly for him this week, pointing out that he won 45 percent of the vote in the Democratic Party primary. The Vermont senator is scheduled to speak to his delegates in a private meeting Monday afternoon, and will address the full convention in a prime-time speech Monday night. Outside, his supporters plan demonstrations and rallies all week.

And inside the massive ballroom Monday where the California delegation met, they rained boos on every politician who uttered Clinton’s name — even fellow progressives like Rep. Barbara Lee, D-Oakland, and state Controller Betty Yee.

Back to Gallery California Bernie Sanders supporters boo mention of Clinton 2 1 of 2 Photo: Joe Garofoli / / 2 of 2 Photo: Joe Garofoli / The Chronicle / /



But they directed their loudest boos at Padilla, who many Sanders supporters blame for not accurately tabulating ballots cast in the June 7 California primary that Clinton won.

“I appreciate your passion,” Padilla said, even as much of his speech Monday before the delegation was suffocated by boos and chants of “Bernie! Bernie!” and “Count the votes!”

One Sanders supporter briefly held up a “Bernie” campaign sign in front of Pelosi as she spoke, while others booed and jeered the San Francisco Democrat, who did not endorse Clinton until the day of the June 7 California primary. Pelosi praised both candidates in her speech while plowing through the jeers.

Afterward, Pelosi shrugged off the boos as the continuing passions of Sanders’ supporters, saying she’s seen similar outbursts at other conventions — citing the vociferous supporters of California Gov. Jerry Brown in 1976 and former Colorado Sen. Gary Hart in 1984.

“You know what — it’s the Democratic Party. We have never been a monolith,” Pelosi said Monday. “We’ve always tried to reach a consensus but unanimity is an impossibility for any party.

“This is interesting, and it’s entertaining to a certain extent. And it might be grist for your mill to write something,” Pelosi said. But what is key to keep in mind, she said, are the fundamental differences between Clinton and Republican nominee Donald Trump.

But Sanders delegate Tim Knox said the demonstrations will keep coming as long as Clinton is the presumptive nominee. Clad in a tuxedo and pro-Sanders buttons, Knox, the mayor of Amador City, Calif., believes there is still a chance for Sanders to win.

“All the mentions are of Clinton here on the floor (at the breakfast) is that she is the nominee,” Knox said. “But right now Hillary Clinton is the presumptive nominee — she’s not the actual nominee.”

Knox wants to hear more respect. He wants every speaker to mention Sanders and the energy he brought to the party. (Pelosi and several other speakers did, but it didn’t dampen the boos.)

Will these protests end should Clinton become the party’s nominee this week? Said Knox: “We’ll have to wait and see what happens.”

Joe Garofoli is the San Francisco Chronicle’s senior political writer. Email: jgarofoli@sfchronicle.com Twitter: @joegarofoli