Cain is becoming the first Republican presidential contender to have it. His request was approved by Homeland Security Secretary Janet Napolitano and congressional leaders Thursday.

Source: http://www.npr.org/2011/11/17/142480843/herman-cain-receives-secret-service-protection?ft=1&f=1014

Sherrod Brown Susan Collins Kay Hagan Claire McCaskill Bob Menendez Jerry Moran Mark Warner Ron Johnson