It's important to humiliate Jeb, to send a message to those who planned to buy the nomination for him....don't waste your money. Just as it was important that Cantor lose that primary to a better man, it sends the "mad as hell" message. One reason is Terri Schiavo....Jeb is unacceptable and the elitists don't care. Let them go down ASAP!
Christie has the strongest personality of the establishment candidates, which means that he would be the most aggressive advocate of RNC-approved policies if elected.
But we're splitting hairs here. Arguing over Bush,Christie, and Rubio is like asking whether you'd rather die of plague, cholera, or typhus.