Kentucky could be heading for a historic change this year as it moves closer to abolishing its law banning felons from voting, thanks to a bipartisan effort in the state Capitol and a big assist from Republican U.S. Sen. Rand Paul. The state has long had among the most restrictive felon voting rules, thus disenfranchising a high percentage of its voting-age population. Black residents have been disproportionately affected — more than one in five of voting age cannot cast a ballot. A long-running push by voting rights advocates to end these restrictions got a boost from Paul, who this week pushed a compromise in testimony before state lawmakers. Republicans in the legislature, who control the Senate, for the first time agreed to ease the ban. ”It has the best chance it’s ever had,” said Senate Majority Floor Leader Damon Thayer. Even as advocates for expanded voting rights anticipate a victory in Kentucky, they have a long road ahead in the many other states that continue to bar felons from casting ballots, disenfranchising millions. The years of effort and the convergence of political forces that could lead Kentucky to change its law show how difficult the challenges can be.