Hillary Clinton has hired two political operatives from her 2016 presidential campaign to help manage Onward Together, the project she founded this spring with former governor Howard Dean to fund and support a coalition of Democratic groups led by activists and organizers. The new additions, Emmy Ruiz and Adam Parkhomenko, held central roles on Clinton’s campaign: Ruiz delivered key victories as state director in Nevada during the primary and in Colorado during the general election; Parkhomenko worked in headquarters as her director of grassroots engagement before moving to the Democratic National Committee. Both served on Clinton’s first presidential bid in...