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Santorum to pick up endorsement from former OH senator

Sources close to the Santorum campaign confirm that Ohio Attorney General -- and former U.S. Sen. -- Mike DeWine (R) will switch his endorsement from Mitt Romney to Rick Santorum today.
 
An announcement is scheduled for 2:00 pm ET, in Columbus, Ohio.
 
DeWine endorsed Romney in October; previously he had been a Pawlenty supporter.

DeWine served in the U.S. Senate with Santorum; in fact, both lost their races for re-election in the Democratic sweep of 2006.