Libertarian Party candidates may have cost Senators Jim Talent (R.-Mo.) and Conrad Burns (R.-Mont.) their seats, tipping the Senate to Democratic control. In Montana, the Libertarian candidate got more than 10,000 votes, or 3%, while Democrat Jon Tester edged Burns by fewer than 3,000 votes. In Missouri, Claire McCaskill defeated Talent by 41,000 votes, a bit less than the 47,000 Libertarian votes. This isn’t the first time Republicans have had to worry about losing votes to Libertarian Party candidates. Senators Harry Reid (Nev.), Maria Cantwell (Wash.), and Tim Johnson (S.D.) all won races in which Libertarian candidates got more votes...