There aren’t many people like Michael Wear in today’s Democratic Party. The former director of Barack Obama’s 2012 faith-outreach efforts is a theologically conservative evangelical Christian. He is opposed to both abortion and same-sex marriage, although he would argue that those are primarily theological positions, and other issues, including poverty and immigration, are also important to his faith. During his time working for Obama, Wear was often alone in many of his views, he writes in his new book, Reclaiming Hope. He helped with faith-outreach strategies for Obama’s 2008 campaign, but was surprised when some state-level officials decided not to...