Get specific. That’s the message conservative intellectuals and strategists have for the Republican Party as it faces an assault from President Obama and Democrats on issues resonant with struggling voters such as the minimum wage and extending unemployment benefits. Obama’s income inequality push comes as the tide appears to be rising for the left on economic and social issues, something evident in everything from New York City Mayor Bill de Blasio’s election to the legal selling of marijuana in Colorado. Some conservatives fear that the party has failed to make its case on how its policies can improve the lives...