Lugar and his wife will have to re-register to vote in Decatur Township for the state's primary election.
The principle issue before the justices is whether people be required to purchase health insurance is unconstitutional.
Senator Richard Lugar says he will repay the taxpayer money he used to pay for hotel costs while he was in Indianapolis.
Senator Richard Lugar is being challenged this election by Richard Mourdock.
The Indiana Election Commission upheld Senator Richard Lugar's residency.
Richard Mourdock says Senator Richard Lugar's residency qualifications are in question.