Who is the most likely to drop out?

[Famous Mortimer]

Thread for random speculation on who is the most likely candidate to drop out, when will they do it, and who will they endorse?

The mainstream Republican candidates are Bush, Walker, Christie, Jindal, and Rubio. Walker will drop out if he comes in third or worse in Iowa. Christie will drop out if he loses New Hampshire. Bush will stay in until South Carolina at least. Rubio and Jindal are hard to tell but I'm guessing Rubio stays in until Florida to try and show his strength with Hispanics. When these people endorse, they will endorse whoever from this group is doing the best.

Paul and Cruz are both Tea Party candidates. One should probably drop out and endorse the other. I'm guessing if Paul wins IA, Cruz drops out and endorses him to give him momentum going into NH.

Santorum and Huckabee both have the same platform, socially conservative economically moderate. It would be smart for them  to work together although I'm not sure either of them are smart. Santorum really should drop out since Huckabee is doing much better in the polls, he's probably stubborn though because he came in second last time.

Fiorina and Carson are there to be tokens so they will be in the race as long as there are still debates and they only drop out to endorse the presumptive nominee.

Pataki will drop out before Iowa and endorse Bush or Christie.

Graham will drop out before Iowa and endorse Bush or Rubio.

Rick Perry and Donald Trump do not obey logic and thus it is impossible to predict.

O'M will drop out and endorse Hillary after Iowa.

No one will notice when Chafee drops out. He might endorse Sanders.

Webb will stay in until South Carolina. No one will want his endorsement.