First of all, the nucleus is held together by the strong nuclear force, not the weak nuclear force (the weak force causes certain kinds of decay, such as a neut

First of all, the nucleus is held together by the strong nuclear force, not the weak nuclear force (the weak force causes certain kinds of decay, such as a neutron to decay into a proton and electron). Secondly, as soon as you have multiple protons, the repulsion from the positive charges will be much, much greater than any dipole attraction. Finally, physicists have done a lot of really precise measurements with subatomic particles, and I don't think a dipole interaction like that would match the observed results.