  We consider an arbitrarily charged polymer driven by a weak field through a
gel according to the rules of the Rubinstein-Duke model. The probability
distribution in the stationary state is related to that of the model in which
only the head is charged. Thereby drift velocity, diffusion constant and
orientation of any charged polymers are expressed in terms of those of the
central model. Mapping the problem on a random walk of a tagged particle along
a one-dimenional chain, leads to a unified scaling expression for the local
orientation. It provides also an elucidation of the role of corrections to
scaling.
