Stacey Abrams emerged from her SUV on a busy Midtown Atlanta street corner on Sunday with a declaration to make to the throngs of voters attending the Atlanta Pride Parade, the annual celebration of LGBT rights in the heart of the city. “We’re here because we stand together, because we know that allies do not run from fights. And because we know we all have pride in Georgia,” she told cheering supporters, adding: “We stand with you and not against you.” Shortly after, she became the first major-party nominee for governor to march in the parade, a vibrant spectacle that...