Only a few hours before the event, the Sanders campaign cancelled Chong’s planned appearance.
"It's lip service to get the votes, but they don't want to endorse what I stand for and what I've stood for all my professional career," Chong said in an interview with The Hollywood Reporter.
Chong has actively campaigned for the Sanders campaign over the past several months.
The pot-smoking icon released an endorsement video in January and has been an outspoken Sanders supporter in recent interviews and appearances.
Despite his best efforts, Chong claimed Sanders got a case of “cold feet” once they had the opportunity to actually appear on stage together.
The Sunday rally took place a day before Chong’s 78th birthday, but the Sanders campaign might be taking itself more seriously as the primary cycle comes to a close.
This latest shift in tactics may be reflected in Sanders ramping up his attacks on Hillary Clinton and the Democratic Party at large.
It seems either Sanders or his campaign staff believed Chong, who recently opened a line of marijuana products, would create a bad association between himself and the Democratic candidate.
The Sanders campaign definitely wishes to widen its appeal, but Tommy Chong ranting about legalization could easily hurt this objective on a national level.
Still, this happened in California, not Iowa.
Also, I'm willing to bet the Democratic Socialist has garnered more votes from potheads than actual democratic socialists, but I digress.
Sanders needs to clinch a win in the key blue state in order to stay relevant, but this latest snub might work against the Vermont senator.
After all, Chong couldn't possibly do any more damage than the 12 percent superdelegate vote at the Democratic National Convention in Philadelphia.
Despite the cancellation, Chong confirmed he still supports Senator Sanders and will vote for the Democratic Party regardless of nominee.