Top cops duking it out with progressive district attorney candidates in the June primary are facing another opponent: the deep pockets of George Soros.

The liberal New York billionaire and progressive organizations are throwing big money to challengers in Alameda, Sacramento and San Diego counties, according to campaign finance records.

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“There’s definitely a change at work,” said Robert Weisberg, co-director of the Stanford Criminal Justice Center. “The mere fact that there’s any kind of legitimate person running suddenly gets people to think: ‘For the first time, I actually get to vote for the DA.’ ”