Background reading:

• National Democrats, fearing that crowded rosters of primary candidates could fracture the party, have begun to intervene by urging some to bow out of the election.

• The party views the California midterms as a particular risk. The state’s nonpartisan primary system — in which the top two vote-getters advance to the general election, regardless of party affiliation — could propel two Republican candidates to the November race.

• Here’s what to watch for in the California primaries, which take place on Tuesday.

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