  The decay of non-topological electroweak strings formed during the
electroweak phase transition in the early universe may leave an observable
imprint in the universe today. Such strings can naturally seed primordial
magnetic fields. Protogalaxies then tend to form with their axis of rotation
parallel to the external magnetic field, and moreover, the external magnetic
field produces torque which forces the galaxy axis to align with the magnetic
field, even if the two axis were not aligned initially. This can explain an
(observed, but as of yet unexplained) alignment of the quasars' polarization
vectors. We demonstrate that the shape of a magnetic field left over from two
looped electroweak strings can explain the non-trivial alignment of quasar
polarization vectors and make predictions for future observations.
