FROM CNN's Jack Cafferty:
There's a saying in politics that goes "Democrats fall in love, Republicans fall in line."
And it looks like it's about time for the remaining Republican candidates to fall in line behind the dominant front-runner, Mitt Romney.
If Romney wins South Carolina's primary on Saturday - where he's ahead in the polls, he will have pulled off a trifecta - winning the first three nominating contests in a row.
At that point, the other candidates - Newt Gingrich, Rick Santorum, Ron Paul and Rick Perry - ought to think about packing their bags and heading home.
It would be a fine time for them to go the way of Tim Pawlenty, Herman Cain, Michele Bachmann and Jon Huntsman before them.
In case they haven't noticed, Republican voters for the most part are backing Romney, as he's opened up a commanding 23 point lead in one national poll.
The new Gallup poll shows Romney with 37% support from Republicans - that's a 13 point jump in this poll since just before the Iowa caucuses.
Rick Santorum and Newt Gingrich are at 14%, Ron Paul is at 12%, Rick Perry is at a measly 5%.
Pollsters suggest that historically, the post-New Hampshire leader in national polls has gone on to win the Republican nomination. Romney is not only leading by more than 20 points, but his margin is growing.
If the other Republicans choose to stay in the race and keep beating up on Romney, they're only giving the Democrats and President Obama more material to use against Romney in the general election.
Here’s my question to you: If Mitt Romney wins South Carolina, should the other Republican candidates drop out and support him?
Tune in to the Situation Room at 5pm to see if Jack reads your answer on air.
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