The “Republican Liberty Caucus” is the Ron Paul/Debra Medina group.
http://www.rlc.org/2010/12/07/rlc-gathers-coalition-to-support-ron-paul-chairmanship-bid/
http://www.dailypaul.com/123858/republican-liberty-caucus-rlc-endorses-debra-medina-for-governor-of-the-state-of-texas