At issue is how the election division in Secretary of State Connie Lawson's office allows local officials to remove voters from their rolls.
Braun is pouring roughly $800,000 of his own money into his campaign.
Indiana county clerks say they have received nearly 473,000 early voting ballots with a week to go before the general election.
Connie Lawson defeats Marion County Clerk Beth White in the race for Indiana Secretary of state.
Leaders of the Indiana Democratic Party say they are hoping to break the GOP's supermajority in both houses.
More than 2.6 million of Indiana's 4.5 million registered voters cast ballots this year.
Congressman Mike Pence has defeated Democrat John Gregg in Indiana's gubernatorial race.
Hoosiers turned out to vote on Election Day, but in smaller numbers than in 2008.
Area journalists discuss Indiana's state and congressional races during a live taping of IN Focus. Join the conversation on our live chat.
Zoeller previously worked as the chief deputy to his predecessor, Attorney General Steve Carter.