From
wapo: "One Commonwealth, Herring's own leadership political action committee, gave $827,500 directly to Herring's campaign, making it his second-biggest donor after DAGA. The next biggest is Everytown for Gun Safety, which gave $600,000 through the end of October. One of that group's founders is former New York City mayor
Michael Bloomberg."
Democrat Attorney General Association is his biggest donor by far. This article gives some decent background on it and I'm guessing this is how the big money flows nationally.