WATCH: Primary showdowns in California, Iowa, Montana, New Jersey, New Mexico, South Dakota

In California, Americans will decide who succeeds Gov. Gavin Newsom, while Los Angeles Mayor Karen Bass is fending off challenges.

​In California, Americans will decide who succeeds Gov. Gavin Newsom, while Los Angeles Mayor Karen Bass is fending off challenges.  WNT In California, Americans will decide who succeeds Gov. Gavin Newsom, while Los Angeles Mayor Karen Bass is fending off challenges.