Raphael Sonenshein, executive director of the Pat Brown Institute of Public Affairs at California State University Los Angeles, noted that old-fashioned boots-on-the-ground union campaigning won out in the hotly contested Zimmer-Anderson race.

WSJ: Incumbents win 2 slots in Los Angeles school race

How years of simmering tensions between California's Latinos and African Americans will play out in the presidential race is a hotly contested matter.

NPR: Uneasy Black-Latino Ties a Factor in Calif. Primary

The hotly contested race occurred in a newly drawn Democratic-leaning Congressional district northwest of Chicago that Walsh moved into to avoid battling another Republican.

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