I see it like a family, if we have issues we settle them internally. We then present a united front against the outside.
I may argue all morning with my brother but I will fight day and night against anyone who threatens him.
In politics I think we should argue for the candidate of our choice during the primary. But after the party has selected their standard bearer, then we should all fall in line behind them. Until the next election.
It may not be our favorite, but splintering the group is going to insure that the socialists keep control.