The 2020 presidential race will start any minute now, with California Sen. Kamala Harris saying she’ll decide “over the holiday” whether to run and Los Angeles Mayor Eric Garcetti promising to make his intentions known before the end of the year. The Californians — both of whom are expected to run — could trigger an avalanche of announcements in January among the two dozen or so Democrats harboring White House dreams. Former Housing and Urban Development Secretary Julian Castro announced Wednesday that he formed an exploratory committee, usually a precursor to a run. The entire field is expected to announce by the end of April.