Hillary Rodham Clinton is not going to be the first woman president. Environmental Protection Agency Chief Administrator Gina McCarthy will be. You know how I know? She just pulled off the impossible. This morning she came out in Newark with the city Mayor Ras J. Baraka and its former mayor, U.S. Senator Cory Booker, to introduce a “first-of-its-kind community air monitor” as part of an effort to help communities build expertise around collecting environmental pollution data.

The impossible is not the air monitor project — communities have been finding DIY ways to monitor air  for years (because the EPA’s has been random, and lacking). Just Google “bucket brigade.” The impossible is that SHE BROUGHT CORY BOOKER AND RAS BARAKA TOGETHER.

If you don’t understand the significance of this, let me help you. Booker and Baraka have been the bitterest of foes. When Booker was mayor, his much ballyhooed wooing of Silicon Valley and Wall St. billionaires to help reform Newark schools incurred the wrath of then-city council member Baraka and many of Newark’s black parents whose children have come out no more advanced because of it. (You can read more about this in detail in Dale Russakoff’s profile of the situation in The New Yorker last year.)