As Mitt Romney sets out this week to promote his new book, “No Apology,’’ he is also auditioning for a rapidly disappearing role in American politics: a politician who is speaking out against the “temptations of populism.’’ “The populism I’m referring to is, if you will, demonizing certain members of society: going after businesspeople, going after Wall Street, going after people who are highly educated, people who are CEOs,’’ Romney said in an interview.... [snip] Instead of ideological fervor, Romney is working to win over Republican voters and party elites with intellectual sobriety more tightly linked to his career as...