The Democrats’ tentpole is Priorities USA, a five-year-old super PAC that has access to the party’s biggest donors and the implicit blessing of Mrs. Clinton, and is now on track to raise $173 million by Election Day. That is more than any equivalent Democratic effort in history, including the controversial big-money groups set up by wealthy liberals a decade ago to unseat President George W. Bush. The PAC is closely coordinating with environmental and labor activists and other organizations set up to harness support from veterans, African-Americans and Latinos.
In twice-monthly meetings at a Democratic law firm in downtown Washington, officials at Priorities have convened representatives of a dozen super PACs and progressive organizations to carve out swing-state turf and share intelligence from organizers on the ground. Several have pooled money with Priorities USA to purchase television and digital advertising through the same media firms, allowing smaller groups to get better rates. (Other left-leaning organizations, including labor unions and a super PAC founded by the billionaire environmentalist Tom Steyer, have separately spent significant money on field organizing.)