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-43: This urban district includes Los Angeles International Airport (LAX) and the inner-city neighborhood of Inglewood, as well as parts of Torrance and Carson in the South Bay. Represented by liberal Democrat Maxine Waters, the district is nearly 20% black and nearly 50% Latino, and is landlocked, tucked behind the more conservative beach cities to the west. It is also a heavily industrial area, affected by the huge port nearby.

Prospects:

Democrats: There is fertile ground in this working-class area for both Clinton and Sanders to pick up delegates.

Clinton 3, Sanders 3

Republicans: Trump will likely dominate among the district’s relatively small number of Republican primary voters.

Trump 3, Cruz 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.