Is Bernie Sanders or Donald Trump a greater long term threat to the principles of classical liberalism? Trump’s program is antithetical to classical liberalism. He wants to follow protectionist trade policies. He has disclaimed any interest in reforming the burgeoning entitlements that are the principal engines for growing the state. He seems to quite content to praise authoritarian leaders abroad, like Vladimir Putin. He wants to make it easier for public figures to sue private citizens for their criticism. And he is so vulgar and gratuitously offensive that he undermines the culture of self-restraint necessary to the classical liberal order.
Of course, Sanders is worse on many of these axes. He not only wants to preserve all entitlements but add to social security and to create an entirely new entitlement to higher education. He also is a protectionist. He would destroy the private provision of health care. And he would raise tax rates sky high. As for authoritarianism, he seems to have trouble condemning any regime, such as Cuba, so long as he can entertain the false belief that the regime has been good for the social welfare of its citizens.