It's midafternoon on a weekday, but the University of Texas at San Antonio is in the grips of Betomania.
The first students get in line five hours before Rep. Beto O'Rourke, the Democrat trying to unseat Sen. Ted Cruz, R-Texas, is scheduled to speak, and when the doors open, the line snakes out the building, across a long breezeway and through two floors of the next building.
After the auditorium fills to capacity, hundreds push against the registration tables outside, waving their arms for pins and yard signs to be tossed their way. "We're not gonna leave!