The first test in the race to replace Sen. Dianne Feinstein of California is a year away, but the top three contenders are already furiously raising money, crisscrossing the state and amassing endorsements in what could become one of the most expensive statewide contests in recent memory. Reps. Barbara Lee , Katie Porter and Adam Schiff have been hitting the campaign trail hard, shoring up support and introducing themselves to new voters since Mrs. Feinstein announced in February that she would retire at the end of her term. The trio are some of the biggest names in Democratic politics but the field appears wide open, with no candidate drawing more than a quarter of the vote in an early poll.

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