(HARRISBURG, Pa.)—Giddy if exhausted, Hillary Clinton embarked on a post-convention Rust Belt bus tour just hours after becoming the first female presidential nominee of a major political party. The celebratory mood quickly evaporated amid fresh revelations that hackers had breached a program used by her campaign and Republican nominee Donald Trump promised to sharpen his barbs. “Remember this,” Trump said during a rally Friday in Colorado Springs, Colorado.