Fortunately, there is an objective way to measure how libertarian or "anti-libertarian" Barr's record in Congress actually was. The Republican Liberty Caucus has been publishing its annual Liberty Index since 1991. For Congress, the Liberty Index selects 40 key votes each year, half on economic freedoms and half on personal liberties, using those votes to rank Congressmen on a Nolan Chart (like the one at the top of this article). A rating of 100 would place a Congressman at the top of the chart -- a "pure" libertarian -- while a rating of 0 would place him or her at...