President Joe Biden’s inauguration marks not only a new administration’s beginning but also a new chapter for the loyal opposition. The Grand Old Party lost the White House while picking up U.S. House seats, holding half the Senate, and adding to its numbers in state legislative chambers. These conflicting outcomes leave Republicans facing the difficult task of cementing blue-collar Trump voters into their ranks while regaining strength in the suburbs and making inroads with an increasingly diverse electorate. To rebuild, Republicans must decide what their party stands for. The way forward begins with clarifying what the GOP’s answers should be...