The bulk of their philanthropy is nonpolitical (arts, education). One of them founded CATO which is about as pure libertarian as you can get. I would say their main focus is free markets, small government, but you can’t ignore the fact that they are pro legalization and pro gay marriage.
True on CATO and on a couple of pure libertarian beliefs - but the vast majority of their impact, the vast majority of the money, the vast majority of everything they’ve done in the past 5 years has been classic conservative Tea Party type stuff - free markets, low regulation, shrinking government, etc. They know that most of the people they want elected do not agree with them on drugs and gay issues - but they understand those are NOT priority issues.