I think Ed Thompson or Ron Paul would both be good nominees, and could potentially break the 1% mark.
who's Ed Thompson?
Brother of former Republican candidate Thommy Thompson.
Also a credible politician. Best performance by a Libertarian in a competitive three-way (competitive meaning the Dem and Rep were close; Carla Howell I believe got 12% but that was a Ted Kennedy landslide with a joke Republican) statewide race that I can think of with 11% running for Wisconsin governor, was included in the debates even. Was elected the mayor of his hometown a couple years ago and he wasn't even on the ballot, got elected via write-ins (annoying the one standing candidate who thought he would get voted in by acclaimation).