She said a lot of the policies decided at election time effect inmates and their families because they often come from lower socioeconomic groups. A lot of prisoners are knowledgeable about politics and are following election coverage, Ms Earl said and voting would mean prisoners participate in the community before they are released.
"A lot of them are in the position of saying that it doesn't really matter what I don't have a voice," she said.
Mr Workman said if prisoners were allowed to vote the large Maori population in prison could make a difference in close election races.
"The Maori electorate is a great deal smaller (population-wise) than the other electorate so it could in theory effect the election results," Mr Workman said.
Sensible Sentencing Trust's Northland spokesman Steve Detlaff said the trust did not have an official position on the matter but personally he was strongly against prisoners voting.
"If a prisoner is in jail for committing murder or manslaughter they have taken away that right to vote from their victim so why should they be able to vote?" Mr Detlaff said.
While he had some sympathy for people imprisoned for less serious crimes, he said for the sake of clarity and fairness there should be one rule for all.
New Zealand is one of the only countries in the developed world where there is a blanket ban on prisoner voting. Australia allows prisoners serving sentences under three years to vote, while Canada allows all prisoners to vote. The United Kingdom also has a blanket ban on prisoner voting.