I honestly don't see the appeal of Ron Paul. He's portrays himself as a "peoples' conservative," but I see him more like a presidential version of Arnold than any other thing. He's a man with little actually in common with average Joe American, with a media campaign nonetheeless portraying him as hip. There would certainly be positive things about a Libertarian if he slashed at the military-industrial complex and allowed those wasted funds to be reinvested in the economy, but ultimately, what I believe America needs is a strongman who forces the mass-construction of solar plants and railways across the nation.
He's an anarcho-capitalist basically. He does still support big business as GarretSidzaka said. In fact, if we did institute his ideal "liaise fare" free market, the world economy would collapse even faster than it is now. Fortunately that could never happen, but as President he could do a lot to change the country and world for the better.
I don't know who's portraying him as hip (don't watch TV), but in my eyes, it's his libertarian message that people are latching on to. Getting rid of the police state and the military industrial complex are his key stands that appeal to me and probably most of his other supporters. He is also the only politician who will even mention the completely artificial US currency which they continue to print endlessly, now without even reporting how much they print. This would be my number one issue, if I weren't a Canadian with all his money invested in gold and silver. Anyone who relies on US currency or the stock market to insure their futures should seriously examine how this system works. It is propped up by blind faith basically, and will completely collapse in our lifetime. Paul would remove US troops from every country, restore people's constitutional rights, stop all of the eavesdropping/surveillance cameras, etc. For these reasons the powerful interests would obviously never let him become President, but if he were, it would be the most important change to the United Stats since 1776.
Every other candidate is a continuation of the top down economic dictatorship we've all been living under. No difference between what the country will be like under Bush, Obama, Clinton, or McCain. Maybe diversion issues like gay marriage will get righted, but the economic, military, and police policies will remain identical.
I like Obama too, have since the 2004 speech, but he's beholden to the same CFR types Bush is, and he is not going to change anything. They want us to go from blaming the dumb guy to either blaming the black guy, the woman, or the old guy. Anything to make sure we don't blame the system.