I don’t know why they would pick Rubio. He started distancing himself from the tea party 2 weeks after they helped to get him elected. Oh and he’s not eligible either.
Tea Party Express didn’t “pick” Rubio. The press release (http://www.teapartyexpress.org/4852/senator-marco-rubio-tea-party-choice-for-vice-president) is regarding a survey TPX conducted that asked supporters how they would rate all the potential VP candidates. Marco Rubio was the overwhelming favorite, and TPX did not “endorse” him or say they were going to “help” him get there in any way.