Part of the Russian operation’s success is that we cannot measure the effect. Did the DNC emails depress the Sanders vote for Clinton? Did the Podesta emails turn off independents? Would voters have responded differently if major media had reported the email releases not as legitimate news but as an intelligence operation by a hostile foreign power aimed at undermining the integrity of U.S. elections? There are no clear answers. But there are certainties: The email operation increased negative stories about Clinton, fueled an immense propaganda attack and diminished coverage of actual issues. The large polling lead Clinton gained after the debates slipped significantly under this barrage of negativity — even before FBI Director James B. Comey’s bombshell.