Why the Fani Willis Prosecution of Donald Trump Is Indispensable

When Fulton County District Attorney Fani Willis filed criminal charges against former President Donald Trump and over a dozen of his allies for their attempt to overturn Georgia’s 2020 presidential election results, she did something ingenious.

In contrast to Special Counsel Jack Smith’s latest laser-focused federal indictment of Mr. Trump, Ms. Willis charges a wide range of conspirators from the Oval Office to low-level Georgia G.O.P. functionaries and is the first to plumb the full depths, through a state-focused bathyscope, of the conspiracy.

Her case also provides other important complements to the federal matter:…