Should she win the presidency, Hillary Clinton would quickly try to find common ground with Republicans on an immigration overhaul and infrastructure spending, risking the wrath of liberals who would like nothing more than to twist the knife in a wounded opposition party. In her first 100 days, she would also tap women to make up half of her cabinet in hopes of bringing a new tone and collaborative sensibility to Washington, while also looking past Wall Street to places like Silicon Valley for talent — perhaps wooing Sheryl Sandberg from Facebook, and maybe asking Tim Cook from Apple to...