Go back to that clip and notice the number of guys in the "mormon uniform"...suit jackets and white shirts! There were bused in mormon students at an earlier rally.
BYU Students Bus In To South Carolina To Rally For Romney [BYU=mormon university]
"--a boisterous crowd of young, fresh-faced supporters was waving Romney signs and chanting, "MITT! MITT! MITT!"
But this wasn't a grassroots youth movement rooted at the University of South Carolina. No, many of the students cheering on the candidate told BuzzFeed they were actually BYU students and young Mormons from D.C. and Virginia who traveled to the Palmetto State to give their coreligionist's presidential effort a much-needed jolt of energy.