Let 'em all throw their hats in the ring, and we'll see who can really generate some excitement. Sarah will outdraw the lot of them, combined, by a factor of two to one.
No one you named, is drawing anything more than a trickle of interest and speculation about their possible candidacies - except Sarah Palin. Trump is generating nothing but noise. All eyes are on Sarah. She is the ONLY real conservative you named in that bunch.
She's also the only one who can (and will) have the support of the Tea Party, which is absolutely key to winning the White House for the next Republican.
Just being real my friend.