Until she decided not to run, former Vice President Kamala Harris had loomed over the race as a likely favorite. Now, a host of hopefuls are jockeying for advantage.

In the statement announcing her decision, Kamala Harris did not explicitly rule out another bid for the presidency.

A 4.4-magnitude earthquake centered just west of Muscoy, and north of San Bernardino, rattled Southern California at 9:32 a.m. on Thursday, July 31, according to the United States Geological Survey. It some areas, it lasted just a couple of seconds and was gentle. Elsewhere, it went on much longer.

A light, 4.3-magnitude earthquake struck in Southern California on Thursday, according to the United States Geological Survey. The temblor happened at 9:32 a.m. Pacific time about 4 miles west of Muscoy, Calif., data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 4.2.

A magnitude 4.4 earthquake hit Southern California on Thursday morning, according to the U.S. Geological Society.