Likely Bush is hoping to stay afloat until SC, where he, like McCain, might get a victory and change the race. After all, he does have Gramnesty and Haley pulling strings and calling in markers.
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Bush gave his lineage: Daddy was the best president ever and Bro was president and everyone likes Mommie, so I should get elected so I can be a president, too.
[paraphrased]
You'll get a kick out of this.
http://www.urrepublic.com/check-this-out-trevor-noah-might-be-funny-after-all-pay-jeb-25-and-he-will-leave-you-alone/
They can pull all the strings and markers they want. He has a close to zero shot of winning here.