At the heart of Ohio's fiscal problems is a tax system and business climate that has been driving people out of the state for more than 15 years, resulting in a shrinking economy and a smaller tax base.
Undermining the claim within the same article:
From a regional competitiveness standpoint, Ohio is surrounded by states that, generally speaking, have much lower tax burdens. Michigan, Indiana, Kentucky, and West Virginia are all clustered in the middle of the national rankings (27th, 28th, 25th and 29th respectively), while Pennsylvania's tax burden is 11th highest in the nation, but still lower than Ohio's.
What's the link between tax burden and out-migration again?