  We present the results of a reweighting calculation to compute the
contribution of the charged quark sea to the neutron electric polarizability.
The chief difficulty is the stochastic estimation of weight factors, and we
present a hopping parameter expansion-based technique for reducing the
stochastic noise, along with a discussion of why this particular reweighting is
so difficult. We used this technique to estimate weight factors for 300
configurations of nHYP-clover fermions and compute the neutron polarizability,
but the reweighting greatly inflates the overall statistical error, driven by
the stochastic noise in the weight factors.
