I doubt it's as small as you think. He won Iowa (although that wasn't made clear until after the elections). He did well in several of the caucuses.
Watching Ron run for president opened my eyes to the vote corruption that takes place in our country. Especially in the caucasus.
One example I recall is how Ron was clearly going to win a caucus and so the majority of the other republicans decided to group together so that votes could vote for a coalition instead of letting Ron win. That was strange. (This was in 2008, I forget the state).
Then, in Nevada, where Paul won the majority of the delegates, Romney supporters formed their own state party, called “Team Nevada”. The RNC then bypassed the official state party in order to organize for Romney and send all funds to Team Nevada.
In Maine, they cancelled the vote due to a snowstorm, when only 84% of the votes were counted and Romney was leading by 200 votes. Of course, they never counted Washington county, which was Paul's strongest in 2008.
The point is, the corruption is never ending. For that reason, you really have no idea how many people support Ron Paul (and the ideas of the constitution) if you are guessing from votes and media reports.
In fact, perhaps spending a lot of time around Paul, Romney conceeds several times that Ron Paul is actually popular. https://www.youtube.com/watch?v=fx1JWMr5cVk