Won election to federal or statewide office
Ron Paul, Magnificent Exception
Arguably, there is an exception to the no-Libertarians-elected-to-national-office rule, at least if you spell "libertarian" with a small "l". (That is, implying philosophical libertarianism apart from party affiliation.) Ron Paul, U.S. Representative from the 14th District, Texas, has served in the U.S. Congress from 1976 to 1984 and 1997 to the present. He has served as a Republican, but in 1988 he ran for President on the Libertarian party ticket. Although he is no longer affiliated with the Libertarian party, he remains and long has been the most principaled advocate of liberty in federal office.