(AP) — 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. About an hour later, Clinton aides acknowledged that a hacking attack that exposed Democratic Party emails also reached into a computer system used by her own campaign. Clinton and her running mate, Sen.