I doubt all the 18% who said Paul, would vote Paul. I suspect its a protest vote in this poll that has pushed him so high.
He does have alot of support he could draw from people who wouldn't normally vote.
Plus this is the ideal 3rd party election, a recession, an unpopular incumbent vs. a candidate who doesn't inspire his own base. Lots of disaffected voters out there to go for.
If Perot can get 19%, I see no reason Paul can't do about as well. Besides money...
There are lots of Americans who'd love someone who isn't a regular politician