Ongoing disputes in states over voting rights won’t disappear after Senate Democrats lost their attempt to rewrite federal election law — and they may yet return to Congress for an uglier fight next year. Senate Democrats voted together Tuesday but ultimately could not begin debate on a bill meant to overhaul federal election law, with provisions to standardize voter registration, early and absentee voting, as well as redistricting. Sunshine Hillygus, a political science professor at Duke University, told reporters Monday that the laws passed by states such as Georgia and North Carolina, which also tightened ID requirements, may end up running afoul of protections for minority voters under the federal Voting Rights Act.