Arguably, though I wouldn't assume it's necessarily a bubble. Paul's a bit of an acquired taste, and not a lot of surprises there to create remorse once you buy. It's not like people are going to suddenly wake up in a month and say, "Well sh**, he's really crazy about that Constitution thing."
Well, seeing how this whole sh**t has been a series of booms and busts for about every candidate except Santorum, I don't see why Paul couldn't boom then bust just as easily. His core was frequently estimated as 10% of the electorate, more or less, now he's polling higher than that. Surely some of those people are ones who don't fully know everything he stands for.
I've been asked lots of times by people, ''Ron Paul seems really honest and principled, I like that... But what would he actually DO as President?''
The main difference is that Cain et al were all built up by the media to be "serious candidates" before getting destroyed, while Paul was portrayed as a sideshow without a chance of victory and is currently getting a mixture of the "he can't win" treatment alongside constant attacks. I doubt that many of those currently supporting him will be turned off by the basic attacks (Foreign policy especially obviously isn't working on him, since he's been open enough for his supporters to get used to it). I can think of a handful of issues to attack him on that he can't deflect or cause the voters to not care, and thus far his opponents haven't attacked him from the right angles yet.