Well, if he's merely suspending his campaign, Santorum won't release them until the convention. And if Santorum is serious about Mitten's helping him retire campaign debt, they're not going to Gingrich.
If Mittens doesn't need Santorum's delegates to get over on the first ballot, then all the delegates will likely stay aligned with their current candidate. Or the RNC may choose to proclaim a unanimity voice vote, whatever.
Uh...Santorum will direct his delegates to support a pro-homo, pro-abortion candidate? Are you sure about that?