Daniel McCarthy makes the case that the libertarian has begun an "architectonic shift" within the GOP:
More significant than the overall percentage Paul claimed [in Iowa] is the 48 percent he won of the under-30 vote. This augurs more than just a change in the factional balance within the GOP. It’s suggestive of a generational realignment in American politics. The fact that many of these young people do not consider themselves Republican is very much the point: Paul’s detractors cite that as a reason to discount them, but what it really means is that the existing ideological configuration of U.S. politics doesn’t fit the rising generation. They’re not Republicans, but they’re voting in a Republican primary: at one time, that same description applied to Southerners, social conservatives, and Reagan Democrats, groups that were not part of the traditional GOP coalition and whose participation completely remade the party.
And Paul has the money to stick around for a while.