Romney’s mountain of wealth could cast loud echo

WASHINGTON — Mitt Romney’s newly released tax returns rep­re­sent an extra­or­di­nary account­ing of the house­hold finances and far-reaching cor­po­rate invest­ments of one of the rich­est U.S. pres­i­den­tial can­di­dates in gen­er­a­tions, with an annual income that tops $20 million.