WASHINGTON (AP) — Court challenges to Republican-led election restrictions in Georgia and elsewhere face an uncertain road in a legal system that has grown more conservative in recent years. National legislation favored by Democrats could counteract some state restrictions, but that too is no sure thing in a closely divided Congress. Groups opposed to Georgia’s sweeping overhaul of election laws filed suit in federal court in Atlanta on Thursday, a few hours after Gov. Brian Kemp signed the new law. They say restrictions on voting in person or by mail violate the constitutional rights of all Georgians and also disproportionately affect voters of color in violation of the seminal Voting Rights Act of 1965.