MILAN (AP) — Voters in the wealthy northern Italian regions of Lombardy and Veneto are heading to the polls to decide if they want to seek greater autonomy from Rome, riding a tide of self-determination that is sweeping global politics. While the twin referendums Sunday are non-binding, a resounding "yes" vote would give the presidents of the neighboring regions more leverage in negotiations to seek a greater share of tax revenue and to grab responsibility from Rome.