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Here’s my take, fwiw:

Christie, like so many others, has often given the expected canned answer when asked about things like the wall, muslims, etc. Political correctness has affected us all...most of us don’t answer as bluntly as we’d like because we’ll be scorned, called names, etc. Even more so for a politician.

I think what has happened is that Christie has been pretty impressed and possibly inspired by the way Mr. Trump comes out with things that at NOT politically correct, and his poll numbers rise. I think Christie likely thinks more like Mr. Trump and now has the green light to go ahead and join in. I think he also knows exactly what Rubio is, and doesn’t want him in office. He likely also realizes that Cruz would never win the general, and does not want Hitlery as president.

Basically, he’s joining the winning team, and he certainly has the personality to deliver the message.