Credible and realistic reasons are a matter of perspective.
If the goal is to indeed unseat 0 as well as put the US back on the right track to prosperity, then it is painfully obvious what needs to be done.
Realistically:
Romney lacks Credibility, Honor, and Integrity. He knows or should know there is no way he can go toe to toe with 0 and come out a winner. Too much baggage policy-wise.
Santorum is an attorney. Need I say more.
Gingrich has successfully dealt with the n’er-do-well types that currently infest DC. In addition, he has a rather solid track record on the issues that matter most to genuine conservatives. Furthermore, he can and will rip 0 a new one in the debates. This will show everyone that the emperor is indeed naked. Oh.... perish the thought.
The only destructive forces at work are the same ones that genuine conservatives have been up against since day one. Suffice it to say, the main culprits are the MSM as well as mans’ own arrogance, greed, and lust for power.
IMHO, Santorum “owes his mentor” for the backstabbing he inflicted upon him. He should drop out and throw his full support behind Newt. So much for Loyalty, Honor and Integrity..... eh.
Hey... wait a minute... Loyalty, Honor, and Integrity. Are these not part of our founding principles? Hmmm....
Anyone with at least half of a fully functioning brain should have already concluded who We The People need to send up against the Chicago machine.
Pray for Newt.
Santorum has always been out for himself. Every time we are forced to listen to his rhetoric, it is always about him; About his past, how he single handedly authored Welfare Reform during the Clinton years, etc,, (When it was Dole who made an unprecedented move and let a junior Senator (Sanorum) take the floor) and there were many Reps and Senators who actually “authored” the bill, with the original idea being Newt Gingrich's’ in the first place. (Contract With America)
Santorum is a Big Labor, Big Government Moderate who is lying through his teeth. He is an impostor, a phony and a FRAUD! Need I say more?