Foxx has also been endorsed by the progressive advocacy group Gen-Z for Change. The organization’s Executive Director Cheyenne Hunt, who ran in a primary for a House seat in California last year, emphasized that the Arizona race was a key opportunity to uplift young leaders in the party.

For more than two decades, much of Southern Arizona was represented by Rep. Raúl M. Grijalva, a liberal stalwart who championed environmental causes, supported immigrant rights and advocated on behalf of indigenous communities.

Democrat Adelita Grijalva and Republican Daniel Butierez dominated a field of congressional hopefuls Tuesday night to get one step closer to representing a wide swath of southern Arizona in Congress.

The next test of who Democratic voters want to see leading the party will take place Tuesday in southwest Arizona, where three leading candidates are offering competing visions in the primary to fill the late Rep.