The Politico feature says it's about the "... seven-month war within [Hillary's] campaign over the email scandal that just wouldn’t go away..." --- but it is as much about the drip, drip, drip E-mail scandal and Hillary's seven month drop, drop, drop in polling
And, this time, Politico also chose to use a phrase that is 100% WATERGATE --- calling the E-mails scandal >>> "A ‘Cancer’ on the Clinton Candidacy"<<<
The article in "Politico" by Glenn Thrush and Annie Karni sarted with this: "Halfway through her long and humbling summer, Hillary Clinton ran into an old friend who wanted to know how she was bearing up under the pressure of near-daily revelations about the use of her private email server during her time in the State Department. Clinton was unmistakably unhappy.... 'I am having two problems,' she bluntly told the supporter at a social event. 'On the one hand, I feel like I’m rolling out a lot of substantive programs on issues that people care about. We’re getting one day’s news coverage. But there’s nothing larger knitting it together. We’re not breaking through. … And my team needs to get their act together on the email response.'...” (See "A ‘Cancer’ on the Clinton Candidacy..." by Glenn Thrush & Annie Karni, 10/13/15, Politico [http://www.politico.com/magazine/story/2015/10/hillary-clinton-2016-emails-213241?o=0]).
The authors go on to observe, ".... Clinton’s frustration with her own campaign staff was striking. So was her refusal for much of the year to characterize the escalating email controversy as anything other than a failure of communications, messaging or the vast right-wing-and-media conspiracy. Both complaints were consistent with what other campaign advisers told us in dozens of interviews for this story—except some of them laid equal blame on the candidate herself...."