Lawyers for Mason, who was sentenced to five years in prison, say her provisional vote in 2016 wasn't an illegal vote because it didn't actually count.
Crystal Mason is fighting a five-year prison sentence for trying to vote in the 2016 presidential election.
She's appealing a five-year prison sentence and fighting to save her home, all so the state can prop up the myth of "voter fraud." There are serious questions about the case against her.
The groups' decision to sign on means Mason will be represented by some of the top voting rights attorneys in the country.
"What I would like is for Trump to review my situation and Pardon me," wrote Texas prisoner Crystal Mason.