The Republican incumbent raised about $3.5 million dollars in the last six months, nearly as much as Gregg raised in all of 2015.
Indiana Democrats appear to have locked up John Gregg as their nominee for governor as challengers have fallen away in recent weeks.
Sen. Karen Tallian's decision leaves John Gregg as the sole Democrat still in the race for governor.
Ritz raised just $30,000 in the last six months and has about $112,000 cash on hand – less than she started the year with.
Former House Speaker John Gregg managed to out-fundraise the incumbent through June by a little more than $100,000.
Animosity over the Religious Freedom Restoration Act and the Pence administration’s support for the measure has split the state.
The Democratic candidate and former Indiana House Speaker, who also ran in 2012, announced the news Thursday.
Legislators prepare to wrap up the 2015 legislative session, and the DNR is seeing a decline in yearly deer harvests. Read more in today's headline roundup.
John Gregg said in February that he was considering a possible 2016 run for Indiana governor.
John Gregg, who Mike Pence defeated in 2012, is considering a second run for governor in 2016.