The passage of Amendment 4 — by a margin of nearly 65 percent — was the largest single expansion of voting rights in the U.S. since the 1960s. But its effects have been limited, at least temporarily, by disputes over whether past lawbreakers must first pay all fees, fines and restitution, as the Legislature has decided. A lawsuit over that is the subject of hearings next week in Tallahassee before U.S. District Judge Robert Hinkle.