I don’t think Trump was behind in poll any SC poll in the last 7 months. ... Just looked. Carson edged out Trump by 1% in a Clemson U poll early November. Trump has won all the rest of SC polls since July. 17 out of 18 SC polls.
And it’s quite possible Dr. Carson will be lending his support to Trump by then.
I just hope Christie stays in, only for the purpose of slapping Marco Robo around in upcoming debates.