Sanders says in the ad that voters should push to "break the back of a corrupt" campaign finance system, "stand up to Wall Street" and "fight for tuition-free public colleges and universities."
 
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“What choice do Californians have in this election? The biggest one of all," Sanders says in the 30-second ad released Tuesday. "California, it's a long way to Washington, but you can send them a message they can't ignore."
 
A Sanders campaign aide said the ad was backed by an initial $1.5 million buy and is slated to air starting Wednesday in Los Angeles, followed by San Francisco and Sacramento.
 
 
Sanders has this week sought to pressure Clinton to agree to a debate in California, which has 475 pledged delegates up for grabs. Clinton has declined to participate, with a spokesperson for her campaign saying she'll compete in California while turning to focus on presumptive GOP presidential nominee Donald TrumpDonald John TrumpZuckerberg launches public defense of Facebook as attacks mount Trump leaning toward keeping a couple hundred troops in eastern Syria: report Warren says making Israel aid conditional on settlement building is 'on the table' MORE.
 
- Updated at 3:46 p.m.