He does not support homo-marriage, dope or open borders. He believes in the 10th amendment and that marriage and drugs are a state issue. As for borders he wants them more secure not open.
Experience has taught me not to trust libertarians on these issues, as that they often use federalism as just a blind to hide their true beliefs.
Take the dope issue as the prime example. The 10th Amendment argument. All well and good. Libertarians always calmly make these points when I discuss it with them. But when I mention how the 10th Amendment should also mean a state can outlaw dope and enforce very strict laws, and these same folks get all upset and animated on this point. Much more exercised than when arguing federalism. Invariably reveals DOPE is what they care about, more than state’s rights.
Anyway, that’s just my anecdotal experience over the years, and one of the reasons I’ve grown distrustful. And that doesn’t even take into account the uneasy fact that Rand is Ron Paul’s son.