The group says thousands of ballots in Arizona from the 2014 election may not have been counted.
The presidential mid-term election decided some very important races, including governor.
The Arizona Shelby Response Project says that a lot of ballots were discarded in that election and that tens of thousand more votes were thrown out in previous years.
The group says some of those votes could have made the difference in close races.
Their findings will be released later Tuesday morning during a news conference at the State Capitol.
This all comes as lawmakers are working on controversial election laws. Some of the laws are based on a 2013 law which created loopholes for independent expenditures, mandated strict compliance for voter referendums and recalls, limited the ability of third-party candidates to run for office and increased campaign contribution limits.
The law was repealed last year when opponents collected more than 146,000 signatures to put the measures on the ballot.
Another bill given initial approval on Monday criminalizes ballot pickup for anyone but a family member, caregiver or candidate.
The Arizona Shelby Response Project is expected to unveil the results of the study at 10 a.m.