Inmate Leonard Richards is legally allowed to run for office and he once received more than 14,500 votes for a congressional seat.
Leonard Richards, 75, was convicted of killing his half-sister May Wilson in 1982, and of shooting dead his lawyer, Robert Stratton, in 1987.
He is serving a life term in Stillwater prison in Minnesota, where the law allows felons to run for federal office but bars them from vying for state-level office.
Bert Black, legal adviser for the Minnesota secretary of state's office, said the courts have ruled that the agency cannot stop a prisoner from filing an affidavit of candidacy.
"The only valid requirements are that you be of a certain age and that you live in the state on election day, essentially," Mr Black wrote in an email.
He previously ran in the Democratic primary for a congressional seat in 1992 - receiving more than 14,500 votes.
Richards subsequently ran again in 1994 and won more than 4,000 votes.
Guess it can't be any worse than the ones we have in there now, and maybe this guy will actually " do something " if he gets in.
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