I think that Huck and Rick S. are as you say “cut from the same cloth” but Santorum comes across as a teenager, not mature enough for the job, IMHO.
Well I think both men are absolute jokes as Presidential candidates - neither are of that timber or talent, not to mention they are both very bad on conservative issues outside the social realm. But my bigger point is that they get the same Iowa voters - that 30% of the Hawkeye Cauceye that is hell bent (or Heaven bent) on voting for the guy who simply talks about abortion and gay marriage the most....period.
Those voters will split - and Cruz will siphon some off too - although he's got much more talent and potential on conservatism overall than either of these pretenders ever thought about having. And yes, RS is a petulant little bitch boy.