(COLUMBUS, Ohio) -- Ohio Attorney General Mike DeWine has had a change of heart. The prominent Buckeye State Republican plans to throw his support behind presidential candidate Rick Santorum on Friday, switching his allegiance from Mitt Romney to the former Pennsylvania senator.
A source familiar with the endorsement plans told ABC News that DeWine will make the announcement on Friday in front of the Ohio State House in Columbus.
Santorum will become the third presidential candidate DeWine backed during the primary season. The former U.S. Senator who served alongside Santorum in Washington, originally endorsed Tim Pawlenty before moving to Romney after Pawlenty dropped out of the race.
DeWine served for two terms in the U.S. Senate and four in the House of Representatives. He announced his endorsement of Romney last October.
Copyright 2012 ABC News Radio