KEENE, N.H. - For months, former president Bill Clinton has largely stayed out of the 2016 race, mentioned mostly in passing by Democratic front-runner Hillary Clinton. Now, following days of attacks over his sexual history from Republican front-runner Donald Trump, Clinton is escalating his public involvement in his wife's campaign. On Monday, he headed out for his first solo campaign events with stops planned in New Hampshire, a key primary state that gave much-needed momentum to his struggling 1992 presidential bid. But some of the less desirable moments of his past - his impeachment and decades-old sex scandals - are...