Hillary Clinton announced Friday that she wants to enlist 5 million new volunteers into a “national service reserve” aimed at 18- to 30-year-olds. “What if we strengthen the culture of service in America? So it wasn’t just something we did one day a year, but it became a regular part of our lives,” she asked in a Florida rally on the topic of national service Friday. The former secretary of state argued that her volunteer plan would help combat growing self-segregation in America, where people surround themselves with people who think, talk, look and read the same news as them....