Four days before the 2016 congressional primary in her Northern California district, Erin Schrode woke up to tens of thousands of messages. They were ... in her email, on her cellphone, on her Facebook and her Twitter and her Instagram. All would laugh with glee as they gang raped her and then bashed her bagel eating brains in," one said. It has been two years since Ms. Schrode ... lost her Democratic primary and moved on. But the abuse - a toxic sludge of online trolling steeped in misogyny and anti-Semitism that also included photoshopped images of her face stretched into a Nazi lampshade and references to "preheating the ovens" - never stopped. The 2018 election cycle has brought a surge of female candidates. A record number of women ran or are running for the Senate, the House and governorships. And in the process, they are finding that harassment and threats, already common for women, can be amplified in political races - especially if the candidate is a member of a minority group. Last year, sexist and anti-Semitic abuse helped drive Kim Weaver, an Iowa Democrat, out of her race against Representative Steve King. The neo-Nazi website The Daily Stormer published an article ... titled, as Ms. Weaver recalled it, "Meet the Whore Who's Running Against Steve King," increasing what was already an onslaught of threats. When she withdrew from the race, Mr. King suggested she had made up the threats. No independent organization appears to formally track incidents of harassment.