Where Did Ron Paul's Youth Wave Go?

Karl-Thomas Musselman has a great diary over at the Burnt Orange Report asking "wtf happened to all those Ron Paul youth supporters?"

As a basis for his diary, Karl points to a Ron Paul rally held on a University of Texas campus recently. The rally had 4,000 attendees, but produced only 54 votes for Dr. Paul in early voting on campus.

I've noted in the past that Ron Paul has repeatedly come in 2nd, 3rd, and even 4th place among 18 - 29 year olds in the Republican primaries, and I don't think he's ever broken 20% among conservative youth in a given primary or caucus. Why is that so?

It would be hugely interesting to see a post-mortem analysis comparing the Obama and Ron Paul youth field campaigns . . . or even some decent polling asking why conservative youth cast their ballots for a specific candidate.