It's not like any of those guys stand a chance of getting elected, anyway. Santorum and Carson are basically unelectable because of their religious views. You might be able to openly spout extreme religious views as a political tactic in local elections, but that just isn't going to work for a nationwide general election.
As far as the other two, Cruz is as extreme longshot and Jindal isn't really well liked or taken very seriously. The chance of either of those two becoming president is almost non-existent. Cruz suffers from a lot of the same flaws as Santorum, and Jindal doesn't present himself very well.