Editor’s note: The presidential nominating contests in both parties will come down to the California primary.

For Democrats, 548 delegates are at stake — 11.5% of the total. For Republicans, 172 delegates are at stage — 6.9% of the total. Of those, for Democrats, 158 (29%) are divided proportionally on a statewide basis, while 317 (58%) are divided proportionally by congressional district, with each district providing between 5 and 8 delegates. The remaining 73 (13%) are “superdelegates.”

For Republicans, 13 (8%) are awarded statewide, with ten going to the candidate with the highest number of votes on a winner-take-all basis, and three going to “pre-determined” delegates (the State Chair, National Committeewoman, National Committeeman). Meanwhile, 159 (92%) are awarded by congressional district on a winner-take-all basis, with each district providing 3 delegates.

The result: a district-by-district battle in both parties, which we preview for you here.

CA-30: The quintessential San Fernando Valley district runs along much of the 101 freeway and stretches north, taking in the seemingly endless grid of strip malls and homes — and plenty of taxpayer besidess. There are also over 100,000 Republican voters, though the local congressman is a moderate Democrat, Brad Sherman. Sherman was one of the only Democrats to oppose President Barack Obama’s Iran deal openly, calling it “terrorism with impunity.”

Prospects:

Democrats: This moderate district should be one of Clinton’s strongest districts in the Los Angeles area.

Clinton 5, Sanders 2

Republicans: The battle will be hard, but this is among Cruz’s best prospects for a win in Los Angeles County.

Cruz 3, Trump 0, Kasich 0

Joel B. Pollak is Senior Editor-at-Large at Breitbart News. His new e-book, Leadership Secrets of the Kings and Prophets: What the Bible’s Struggles Teach Us About Today, is on sale through Amazon Kindle Direct. Follow him on Twitter at @joelpollak.