The National Review has endorsed Indiana state Treasurer Richard Mourdock over U.S. Sen. Richard Lugar in the upcoming Republican primary, marking another high-profiled conservative voice backing the Tea Party challenger.In a stinging editorial, the conservative magazine takes a swipe at Lugar's residency issues and tells GOP voters they can "do better" than the six-term Senator. Surveys have showed a tight race and a polling firms memo said Lugar is poised to lose his seat.From National Review: The conventional wisdom has been that the six-term incumbent Lugar is a safer general-election bet than his opponent, state treasurer Richard Mourdock. But the primary has heretofore shown Lugar to be out of touch with Hoosiers, an institutionalized Capitol Hiller who for a spell was ruled ineligible to vote in his own primary after a local board determined he hadn’t owned a home in Indiana in three decades. Though a subsequent ruling allowed Lugar to claim a family farm as a residence, the die is cast. Lugar has become a carpetbagger in his own state.Thus far, the National Rifle Association, Club for Growth and Indiana Right to Life have all endorsed Mourdock over the longtime incumbent.