Working from memory, here. I think the dates/order is right.
1984 Reagan (Republican)
1988 Bush (Republican)
1992 Perot, Bush (Texas Governor).
1996 Harry Browne (libertarian)
2000 Harry Browne (libertarian)
2004 Michael Badnarik (libertarian). Bush is
a dangerous religious extremist, not much different than the Islamist
extremists he is so famously fighting. They both have the opinion that
their moral system should be forced on others, no matter the damage to
the world. Crusade, indeed. I await the onset of American Sharia law.