I'm not very familiar with him, but that could be one reason for him not supporting Bolton, since Bolton basically told the international gun-grabbers at the UN to KISS OUR gun-owning, 2nd Amendment-supporting-and-defending American ASSES a few years back.
"Isn't Voinovich a gun-grabbing RINO?"
Yes! He says he supports gun owners rights, but votes against them.
His staff quit responding to my emails about this once I started quoting his voting record in response to their assurances that he supports gun owners.