Eight states are holding primary contests on Tuesday, including California, where an unconventional primary system could create headaches for both Democrats and Republicans. The FiveThirtyEight Politics podcast team previews the California races and dives deep on how the state evolved over the past three decades into one of the most liberal in the country. The crew also explores other notable races around the country and the ways incumbency may help Democratic senators this fall.

You can listen to the episode by clicking the “play” button above or by downloading it in iTunes, the ESPN App or your favorite podcast platform. If you are new to podcasts, learn how to listen.

The FiveThirtyEight Politics podcast publishes Monday evenings, with occasional special episodes throughout the week. Help new listeners discover the show by leaving us a rating and review on iTunes. Have a comment, question or suggestion for “good polling vs. bad polling”? Get in touch by email, on Twitter or in the comments.