What is a yell leader?

(CNN) - Much has been made of Republican presidential candidate and Texas Gov. Rick Perry's college experience as a "cheerleader" during his days at Texas A&M University. Except that Perry was never a cheerleader. He was a "yell leader."

Both are spirit organizations at college sporting events, but otherwise they're quite different, and Perry's role as a yell leader during his college days may serve as an early indicator of political instinct and electoral prowess.
The Aggie Yell Leader squad is made up of a group of juniors and seniors who lead the A&M crowds in trained chants at sporting events with hand motions. Unlike cheerleaders, there are no high flying flips, nor are there traditionally women on the squad. The uniforms do not even have a color, but instead are simple white shirts and white pants
    But what makes the yell leader phase of Perry's formative life relevant in the context of the presidential race is the selection process. The yell leader is the highest profile student position on the A&M campus, and they are chosen in a fiercely competitive popularity contest within a current student body of just under 50,000. To have been one of the five students selected for role, at a young age Perry had to have demonstrated an ability to mobilize voting blocs (specifically the A&M Cadet Corps) and politick.
      As the official yell leader website writes, "It is not uncommon for more than twice as many students to vote for yell leader candidates than vote in the Student Body President elections."
      Read more about Perry's time at A&M in TIME here.